"titanium hardtails" is nearly (nearly) as vague as asking for advice about choosing, say, a "red car".
titanium is a metal, and good quality, engaging bikes (which I would hope you would wish to purchase, considering titanium frames are not cheap) should be gauged by more than what they're made out of.
bikes, interestingly, are often segregated according to frame material, wheelsize, or suspension travel, rather than "what they're good at doing".
titanium frames are very lovely though particularly the way that you can run 'em over with a kitchen scrub, put on new stickers, and make them look box-fresh. So for that reason I'd never get a bead-blasted one. 'Cept I have a bead blasted one 🙁