I would say the rest are fun to shoot, but the m91 and its variations are my choice. In my opinion, the most durable rifle ever.
After the big asteroid wipes us all out, millions of years from now some alien race will find all the 91/30's and think that one was required to be owned by everyone on the planet.....
Great question! Since I'm still a rifle newbie I'm gonna have to go with the mosin family. Durability, affordability, blah blah blah.
The sks is a close second though.