I always run cockpit. You need to optimize as much as possible the viewpoint within it.
Now, this does mean certain cars become more difficult than others for certain tracks because of viewpoint.
Often the c pillar can block easy view to apex on certain corner and car combos, so you have to find the ones best suited to most tracks.
I find in terms of cockpit vs bumper....I find after using cockpit so long if I switch to bumper it’s as if there i s a delay between wheel input and vehicle response. It’s as if my inputs are damped slightly. In bumper all you have to look at is the hood, so you get much less feedback visually about the cars attitude. Plus for me it tends to make me look down instead of to apex. The way I can try to explain it is you are only looking at the hood, so when you turn in it can be hard to tell how much the car is rotating, if the car is a pendulum I seem to get a better idea what it’s doing from a viewpoint as close to the cog as possible, however your viewpoint in bumper is totally unobstructed so probably way easier to use this view if you like swapping cars often. In cockpit I feel much more in control or connected to the car. Cockpit has neat stuff also that can help if you use manual tranny like shift lights, the sound is imo better...
View is definitely not something it’s easy to change though if you have been using say bumper for example.
I’d say bumper is best to use the widest variety of cars more easily, and you have unobstructed vision to apex, these are huge advantages, and I see most top players using bumper.
I think cockpit really brings out the unique character of each car far more than bumper.
No comment on chase cam!