I agree with smear, looks like you do not use these tools often, or keep them in good condition.
The top tool is a crimper, and they give you some cheesy stripping holes, rarely work well even when new.
Lineman pliers are not designed for stripping. You will see electricians use these as strippers, however, takes a while to learn how to without nicking the wire.
Cannot say much about the bottom tool, looks like one of those fancy strippers for electronic hobbists.
I found what most electricians use, see photo, here for less than $13.00:
Ideal Industries 45-125: Ideal T-7 Low-Cost Wire Stripper 22-30 Solid
As long as the correct slot is used for the correct size wire, foolproof.