Planning my next build. My current mountain bike is a 29er hardtail Sette Razzo Carbon. Nice bike but I'm getting older with back trouble and a friend advised me to get a FS.
My only and biggest requirement is that it climbs well. Which frame and rear shock combination would be suggested for this?

Should I do FS? What about a plus frame with wider tires? I'm open to a 27.5 as well but was trying to utilize my current wheel set.

Thanks!