Which Manga Should I Read

Why should I read manga?

The general order of depth that a series shows in its various versions is-Light Novel(LN from now on)>Manga>AnimeGenerally you would not notice the lack of depth between an Anime and a Manga, but u will notice it in comparison with the LN(of course assuming that the basic source material is a light novel).Let me take up some cases-Manga → AnimeFor a series adapted directly from a Manga there generally isn’t much difference as the Animation studios have to take up the basic images, animate them and add voice.Light Novel → Anime → (if) MangaBut for a LN based series they have to take up the important parts and consider what can be animated and what can’t be. Also a lot of times an LN based Anime is released and gets moderately successful, a Manga goes under serialization for the same series cleverly picking up the reviews for the anime and then deciding what parts to edit and continuing even further than the scope of the Anime.Light Novel → Manga → AnimeThis is just the reverse case of the previous one, but with one major difference that a lot of times you would see major differences between the Anime and Manga due to the fact that one is drawn and the other is animated. Animation is expensive and therefore you can’t take a big risk hence, resulting in some common cliché moments across anime. Also some parts have to be omitted due to the general constraints of 12 or 26 episodes. But Manga dues not require a lot of monetary efforts and therefore CAN stick with the storyline much closely(of course in the end it does depend on the mangaka, how closely they want to follow the original story).Summing it up,In the first case watching the anime is well enough (except in cases like Tokyo Ghoul, where they just shit everything up). While in the other 2 cases the Manga is of course better but it also matters upon how things were processed so you could do a little bit of research to find how much deviations the anime and manga offer from the original story.ALSO, these are true for most of the series but you will find some exceptions.One last thing, But as you can easily infer the most original content is always offered in the LN, but indeed its not possible to read the LN of every series.Hope this answers your question :D.

What manga should I start reading?

I was browsing through and thought I can contribute with my own list:Slam dunk - a classic that cause basketball fever in JapanVagabond - by the same artist of Slam Dunk; tells the story of the Japanese swordsman Miyamoto Musashi. Artwork and story is top-notch.Naruto - if you like Ninja stories, this is an awesome series GTO - it is so funny that I still laugh at its jokes even though I have read this a thousand times. NSFW though. One punch man - same artist by Eyeshield 21; it's ridiculous but in a fun way. Bakuman - same artist as Death Note; you wouldn't think that there's material to draw about the life of a mangaka. He proves us wrong! Dragon ball Z - do I really need to introduce this classic?Toriko - rather new manga, but pretty interesting. Adventure genre mixed in with food. Fantasy food that is. One Piece - it is an epic. And it is ongoing. Tokyo Ghoul - Dark but rather interesting plot. I'm now following its sequel Tokyo Ghoul: Re Hikaru no go - Same artist as Death Note and Bakuman, this was one of his early work about the game Go.Horimiya - sweet manga on teenage love.  I read a lot more than the ones listed above but I think those are good start :) enjoy!

Should I read the manga after watching the anime?

It all depends on you and which manga you are reading. If you like the anime and can’t bother to wait for new season, go ahead and read it. You will also be immune to spoilers.In return, one day when the news came out a new sequel is green-lit, when watching it, you’ll notice three things:“Hey, they skipped this scenes. It’s very important!”“Hey, they add a new scenes. I don’t remember this thing happening in manga!”“Hey, the manga handle this scene better! Or vice versa.That’s all I can tell you now, so I’ll leave the judgement up to your discretion.

Should I read the "Attack on Titan" manga or should I wait for the anime?

Since you're asking to read chapter 90, I'm assuming that you haven't read the previous chapters, otherwise you definitely wouldn't be asking that xDThe truth is, yes, you will. Sort of.Let me explain.Attack on Titan, till now, has just been an array of shocking events happening one after the another, without a proper explanation. Chapter 90 is no exception to that. After reading it, I was trying to understand what was happening, for the next 30 minutes, and then I gave up. Until chapter 91 came out. Then the shit got a little cleared up, and then for the next 30 minutes after reading 91, I was like :Holy shit I couldn't have imagined that, holy mother of god this can't be happening !And then when I started watching the season 2 going on right now, I was like :Damn it, so this shit is because of everything we got to know nowwwwwww ?!?!?!?Keep in mind, the anime right now, is where the manga was 3 to 4 years ago. The timing of the anime is a pain in the ass.People would say that I'm hyping it up too much, but trust me, the story as it is right now at 92 chapters, it has the potential to surpass Death Note. No kidding.The manga is on an amazing point of storyline from where it can become the best in class, or turn out to be a fucking waste all this time. If that doesn't arouse curiosity in you, no point reading it now. Just wait for it to finish and the anime to catch up ( you'll probably be dead by then).So, as another answer mentioned, there could be a thousand more chapters more to this manga, so either you could die without knowing the ending, waiting for the anime, or you could die in peace, knowing how it all happened.So TL fucking DR : Go read it from the start damn it, what are you waiting for xD ?