The T/C scopes are inferior to the Leupold, Bushnell 3200 2-6X, and Burris scopes, in my opinion.
The T'SOB base, with it's 6 screws is very strong and the preferred base on heavy recoiling Contenders. On Encores, 4 screw bases appear to be quite satisfactory, at least up through .308 Win. class cartridges. I don't know what you mean by " ribbed barrels ", with respect to an Encore. There's no such thing from the factory. Do you mean a barrel with an aftermarket full length vent rib, like offered by SSK ? If so, there's really no strength advantage to them, versus the standard T'SOB.