Quoted from Eskaybee:ST is pure shooting fun. Warp ramp is the coolest and funnest shot in pinball. Rules progression is a bit lack luster with long ball times. PREM/LE is a must for the whole theme immersion and flow.
GB is starting to show its true colors and camps are starting to divide. While I'm not a fan of it, there is a following. I'd recommend doing some digging into the rules, gameplay, and playing one for yourself before deciding. I'd say go PREM over pro on this one too if you go with it.
Ultimately though; I'd wait it out and see what SW offers.
Agree with ST except I prefer the value of the pro. GB is a good game but is frustrating in some ways. I was pretty much set getting one when it first came out but after playing it more than a few times I changed my mind. For that reason, I think it is always good to wait past the hype and get some plays in. I wouldn't buy SW right away either. Wait and see what qc issues Stern is having that month and how the code shapes up. Both GB and SW will be on sale for a long time so no reason to rush.