I guess I'm greatly outnumbered!
I've been using strippers for >30 yrs, and the T-strippers since I first saw them on the market.
The only time I use a pair of side cutters or diagonals are in a pinch, when my beloved strippers aren't close at hand (very rarely).
I replace the strippers as soon as they begin to get dull.
(No, I don't knick the heck out of wires) [Linked Image]