I'm using Ti until NiFe52 becomes available or until I win a Reliant or some other tcr adjustable mod, then I'll probably use Stainless Steel.
Ni has no advantage over Ti, quite the opposite actually. Contrary to popular belief Ti is dryburnable at low wattage. I've been using the same Ti coil in my STmini for over 2 months now; dryburned and rewicked it a dozen times or so and no sign of it giving up anytime soon. Ni also is very low res which causes us to wind larger coils with thinner wire which makes it very difficult to clean and rewick. Also, the lower res and higher tcr of Ni makes it the worst candidate for temp control accuracy. If you have a "nickel only" tc mod and want to run Ti just turn down your temp about 120°f lower than what you would for Ni, then adjust up from there.
More than you prolly wanted to know but I like sharing