Perhaps I’m opinionated rather than knowledgeable ..
I can’t comment on the Solaris as I’ve never ridden one.
I find I’m very happy on the Canfield 29er geo, I own both – chain stays about 425mm (don’t go longer), HA about 68 degrees on 120 mm (tho I just put my Nimble 9 up to 140mm and that’s a keeper).
The trailsy geo suits me well, stable and fun on the fast alongs and downs, to my mind they still handle fine on XC and climbs too. The short chain stays keep them flickable and keep your weight back a little so you can plant the front).
I think the ‘hardcore’ side of this geo is over-marketed, I think they’re pretty good for most people most of the time. They’re just fun really and to my mind that’s what we’re here for.
I have owned:
Singular Swift – versatile but didn’t push any buttons for me, would buy again for touring or bike packing
Salsa Selma – SS rocketship
I’ve always enjoyed the Niners I’ve ridden (it was a multi day test on an MCR9 that got me hooked on to 29ers), and I’ve tried a Stooge, and if I ever decided I wanted rigid again that would be a no brainer.
HTH.