A riding buddy has an FF29, he likes it, it’s as advertised: stiff, light and fast. Speed over comfort perhaps.
I had a Soul, it didn’t ring my bell in the way Cotics seem to for everyone else around here so I’m done with Cotic. But I never rode a Solaris.
It depends what’s important to you? What are you doing with this bike?
Singular Swift is a good value all-rounder, SSable and steel forks included out of the box. It’s quite versatile, that’s another way of saying I found it a little dull … that’s because I didn’t know what I was looking for, I thought it was the end of a process but it turned out to be a stepping stone. If you want an adaptable, competent bike it’s a good choice.