Far be it from me to suggest that I know what equipment any tour player should be playing. All I will say is that I don't blame Tiger (or anyone for that matter) for choosing the company that offers the most $$$$ at the financial feeding trough.
There can't be that much difference between TM and the former Nike... if anything, I give TM a lot more credence as far as technological equipment with more versatility goes. That said, it's also an indictment of just how out-of-sorts Tiger's swing is... that TM has the ability to give him exactly what he needs compared to the equipment he's played in the past, yet he's still struggling to find fairways.
It's not equipment-related. It's mental/mechanics related. If he was playing Walter Hagen brand clubs and balls from the local Dick's/Golf Galaxy, I'd be more inclined to say he chose equipment poorly.
No piece of equipment is going to square the club up at address, with exception perhaps of the Cobra offset variety mentioned earlier. LOL