CLG : more of a pug style team. they have some good strats and such but they rely a lot on their aimers to carry them
Titan : x6tenz is widely regarded as the best IGL in the game, and his main goal is to utilize Apex & KennyS as well as possible since imo they're 2 of the top 5 players in fragging ability, and either can have days where they play like the best in the world (kennyS being the best player in the world hands down obviously does that fairly often). KennyS is known to be a very aggro awper so a lot of what they do is allowing him to roam and get entries and then they work off of that. Apex is just a very potent entry fragger
NiP : they do a lot of different stuff. I don't want to say anything that's completely wrong, but usually GTR is the lurker type player, and the rest of their players are mostly fairly good at entrying. when they played with maikelele, they tried to let him do his thing a little bit as well because he was an insanely aggressive awper. anyways, I always see them as more of a control style-ish team
Fnatic : one of their strongest points is their ability to easily and fluidly change between playstyles. one game they can play quick, the next fast. they have a ton of smoke strats as well as dry executes. they can do this because they have players that can do a lot of stuff. to top it off they have JW (top 3 awp in the world) and olof (honestly, I'd rank him pretty far up the list in awp abilities, even past a lot of main awpers). they like to do a lot of the same types of thing that titan do with kennyS, which is just let their main awper (JW) go aggro and find picks when he's feeling it. olofm mostly awps on CT side for the double awp setup. he's very good at locking down parts of the map, kind of like skadoodle
LDLC : they have a lot of strong riflers. smithzz can play aggro but he's not really as good at that compared to JW or KennyS. he's sort of like olofm from my perspective in that he's good at locking down areas but he can also go aggressive when needed. their real strengths lie on the fact that happy, kioshima and shox can all get entry frags very, very well if they're having an on day. shox was once the best in the world by a large margin but nowadays he has more off days than on, though his level is still incredibly high. NBK is one of the few players in the game that use the auto sniper very much and he's said he's the best in the world with it.
IBP : best 5 players in NA hands down. Swag very good at entry fragging and especially good at lurking but not as much in the GTR style. IBP often sent swag alone but instead of staying hidden in the shadows, he could just work a site solo. of course he was also very good at entry fragging or that wouldn't work too well. dazed : hybrid, strat caller. decent at both. skadoodle : shutdown awper. when I think about a dream team from NA, I like to think of putting skadoodle and shahzam together where skadoodle plays the olofm role. skadoodle is sort of like smithz in that he can go aggro if he needs to, but is a more passive awper. he likes to, from what I've seen, play angles where he can lock down an area. he likes to play car on dust2 and shut down that area more than he likes to do super aggro pick strats (though maybe that was a team thing more than a player thing).
C9 : the games I told you to watch were when they still had hiko, and at that time they were honestly a bit of a pug team. they didn't have a strong awper at all so they really worked more based on the fact that shroud, n0thing and hiko could have on games and absolutely demolish teams. sort of like a less skilled more disorganized LDLC in general. if you think about it from a betting perspective, betting against c9 is basically betting that n0thing is going to have an off game. when he's on, he can be absolutely lights out.
piter : lol nobody knows
VP : I don't have much knowledge about them, but I believe they're more of a strats based team and they're stronger on CT side than T.
CT or T sided team (which side they are known to be better on)
Titan : somewhat T sided
Fnatic : notably CT sided
VP : CT sided
LDLC : even
IBP : imo somewhat CT sided, but pretty even
NiP: idk
CLG : idk