I'm going to be doing some screwing/unscrewing of screws that provide both a utilitarian and aesthetic function, so I'd like to protect the painted coating on the heads as best I can when I remove and re-insert them.
These are Torx (T45) rather than Philips head, so fortunately the heads are less likely to strip or be damaged than they otherwise would be. But having never used an impact driver before, while also having stripped plenty of Philips screw-heads with regular screwdrivers in the past, I am wondering what the best option for this job would be.
In short: in general, which is gentler on the coatings of screw-heads: regular screwdrivers, or impact drivers? (Impact drivers sometimes shearing off screw heads in the case of overtorqueing notwithstanding)
Addendum (added from comments):
I'm doing some automotive work on a new vehicle. The bumper has a bunch of T45 bolts on it that are removable to add / remove accessories, and I'd like to keep them in the best shape possible, both for aesthetics and to prevent rust. While I'm specifically asking this question for this project, knowing whether or not impact drivers make screw head stripping less likely will help me decide whether or not buying an impact driver is worth it for the few projects I do.
The screws in question are actually just going through the sheet metal of the bumper and aren't structural - but yes, in fact the "regular screwdriver" I was originally planning on using actually will be a socket wrench with a T45 socket.