If the production piece actually looked like this I'd be tempted to get this over the HT one, and still display it with the HT figures since he's an alien. The head doesn't look cartoony at all. The only thing that looks cartoony is his hands.
I do think the proto looks pretty dang solid. But SS really shot themselves in the foot with those production pieces of Kenobi and Anakin. I really do like the HT version but I would love to have this as his CW look is superior to his BoBF look.