I use Shubbs mostly, with the aforesaid tweak after fitting to let the bass strings "breathe". The best capos I ever used were nylon Heribas, which had a comb arrangement which kept the strings in tune. I still have one, but, since they seem to have disappeared from the market, I seldom take it out of the house.

A downside - Heribas give off a farting sound from the plastic ratchet that secures them if you don't fit or remove them carefully. Get's some funny looks when amplified!