there aren't set aim styles, just practice shooting things and whatever works better for you will just end up being the way you aim

yeah, just practice clicking on people and do what comes naturally

obviously the pistol, etc require tracking

Style based. Generally most people who snipe and shotgun flick, while heavy/SMG is tracking. People generally don't track with shotguns and sniping because of the extra effort/mouse movement it takes when you're only shooting every ~.6 seconds (longer with sniper). You can still choose to track though, up to you.

i keep thinking you're the shithead blur/crusader because you even have the same number of r's as his original alias

Tracking is generally thought of as better because flicks are fairly inconsistent. If you can keep the crosshair over the enemy the entire time (track), you will easily be able to hit hitscan shots, but if you constantly flick to the target, hitting them is going to be much harder.

From my experience playing scout, I often flick when I'm not thinking, and usually miss when i flick. When I slow myself down and take the time to actually attempt to keep my crosshair on top of the other person, I hit many more shots.

Don't limit yourself to "practicing 1 of the 2" because there are plenty of people who can do well with either type.

P.S. If you are talking about scout v scout, that is an entirely different story.

Tracking is better, but it's not humanly possible to track everything, so you snap/twitch/whatever to make up for it.

When not using an exclusively tracking weapon (minigun/SMG/Pistol) like shotguns, I find it beneficial to "keep the crosshair near the guy" and twitch the last bit I need.

This is rather personal, but I find having a stupidly high viewmodel_fov for tracking weapons makes it easier to track. e.g. 120 for Scout pistol. Try it if it sounds like your thing.

as grape said ,just aim the way u like and its better for u
i switched form flickshot to tracking and i missed a lot for like 1 month or so
dont do the same and just keep aiming the way u do

If you can flick consistently well it will be better than tracking because you will be able to aim and shoot faster, thus killing your enemy faster, but only a few can do that, it's also more intrinsically connected with your mood, so you will have more bad acc days because no one is under the same state of mind everytime. Tracking is a less aggressive way, but may give you a lot more consistency.

I think it was lange who said this but I don't remember. Tracking is good because it is more consistent, and as you get better at it, you'll do it faster. Then, while it might look like a flick shot to someone else, what you actually did was just track to them really really quickly.

I'd say working on your tracking, and save flick-shots for when you have zero time to react, or you're feeling really lucky.

both, whichever one you do naturally, do the opposite

tracking is obviously preferable because of the consistency, but obviously having perfect tracking is impossible.

I would advise focusing more so on prediction of the enemy model makes lining up that shot much easier, obviously the only way to have good prediction though is to play the game alot.