Hype for me, although cost was definitely a factor. I read a whole lot of stuff about people banging on about this or that film that I had to try them. So I ended up with a freezer full of films from fleabay, which I'm still working through.
Haven't as yet decided on many favourites to focus on. There's definitely RVP50and RAP100 which have their specific uses in colour, as does Portra 160.
'old' TX has that massive old-school grainy feel. 'new' TXP, TMY, and HP5 I don't see much difference in, I use them interchangeably, and tried pushing them all to 1600 with limited success, so now it's Delta3200 in microphen only for 1600 and above.
In the 100 range, I've got APX100, TMX, Rollei Retro 100 (which was a cheapass bulk-roll I haven't finished), FP4, and Delta100 and don't see much difference between them for the uses I've given them. FP4 in Rodinal definitely gives that sharp-lines and grainy-sky look, if that's what I'm after at the time.
Slower I've got some APX25, KB25, and ATP1.1, but they'll remain for 'special' occasions, and eventually it'll just leave PanF for slow simply based on price&availability.