When it comes to Hardtail frames, it’s 95% geometry and about 5% frame material that makes the difference.
And steel is already more springy/forgiving than aluminium in most applications.
Ti frames are really hard to justify IMO, WAY harder than an expensive full sus bike… And I’ve also ridden some pretty rubbish ti frames too, most notably either too flexy or geometry was all wrong. I have ridden one or 2 very nice ti bikes though, that did make me think (for more than just a moment) maybe I’d be better off with one in my garage…
But the reality is, if you’re buying ti for “the feel” you’re either buying an overly flexy frame (like the Airborne Lancaster I owned briefly), or you’ve bought into the marketing guff.
If you’re buying a ti frame as you absolutely must have a lightweight hardtail frame, but won’t buy an ally or carbon frame for reasons of fatigue… Then that’s more plausible.
If you’re buying a ti frame cos you really believe you will own it and ride it for the next 15 years, then fair enough…
But the extra £1k will save you more than the 1lb in weight that the Soda is lighter than the Soul by spending it elsewhere… And if you REALLY want more give/feel/flex/spring in the back end, spend some money on a decent tubeless wheelset and some fast/big/grippy/light tubeless treads… I’ve been riding for a long time now, frame materials do make a difference but it really isn’t that noticable when compared to other things, and I believe that tubeless tyres make much more of a noticable difference myself.
So there! 😉
All that said, Ti bikes don’t half look sexy though… And money no object, I’d probably have a Litespeed, or a Soda just like that…