Both are great guns. All 'teething' issues with both have been worked out. Make sure you break 'em in before relying on them. I wouldn't buy used. They are cheap enough to buy new.
I won't recommend Taurus 380 unless you don't mind sending it back at least once to make it reliable. Same goes for Diamondback even though they supposedly have worked out the issues. I haven't fired the Hellcat. And, the Kahr/Rohrbaugh/Seecamp... costs more than the others do all together.
Because of the mild carpal tunnel, arthritis, and sewn back on fingers, I have to stick with all-metal guns now. When shooting the Keltec and Ruger, I have to make a concentrated effort to keep a good grip. If not, they'll jam. Extended mags prevented the issues but defeated the purpose of pocket cannon. I settled on a NAA Guardian 380. It doesn't draw blood as quickly as my Seecamp did, and the local shop didn't have a DesertEagle Micro.
I'm beginning to prefer/like all metal guns. I just think that they'll stay in the family longer and turn into heirlooms. Plastic mouseguns in 25/32/380 are plentiful used at gun and pawn shops.