Any point in going back to Open Tee 1 if I own OT2? HS: Get a Grip worth it?

So I can buy OT2 for $6.49 on Amazon, and/or a bundle of OT1 + Get a Grip for roughly the same price as Get a Grip by itself ($10). My question is A) If I get OT2, which I plan to get, does that render OT1 essentially pointless? B) If I do get OT2 and OT1 is rendered pointless, is Get a Grip worth the $10? As I've recently purchased a PSP, there are still plenty of games I want, but for now, I'd really rather invest in games that are really worth it for now. Thank you for any help. :)