I have largish palms, but shortish-thickish fingers.
I find the "medium" backstrap on the M&P .40 to fit me best.
I have above average hand strength.
All that said...
If you're looking for a BUG for no other purpose than being a BUG, then you would be well served to look into the Sig P238.
It's a little heavier than some other candidates (LCR, Bersa, Bodyguard), but I find that weight to be no big deal, and helps with the recoil.
As always, YMMV...