Hard call due to Tua's age. BUT Tua has never had a problem with anyone who fights like Solis. And I am sure that Solis has never been hit by anyone like Tua.
I'll take Solis by complete domination at this point in both men's careers. Tua isn't half of what he once was, and even in his prime I think the Cuban would give him problems.
IF Solis gets in shape yes i think hed beat Tua, Even a out of shape 270 Solis would beat him up to the early mid rounds but i have the feeling Solis would tire and Tua would stop him late.
This :good.........Solis needs to drop weight & Tua still has the power in his punches that would rattle solis' cage