A machette, when I have a nick, i want a real nick!! (Gillette Fusion - just found it too boring giving a straight answer.)
Don't hurt yourself.
I use a trimmer, I don't really shave.A philips one
whatever is on sale. 3-blade disposables, usually, tho i have a mach3, too...i think i got a year out of a bic once
Razor blade, got sick of the hype about two, three, five blades