Hmm, to say ST is the "better" choice over RP may be jumping the gun a little... Don't get me wrong, they've got the prices at a sweet spot for sure! But I think a lot more is involved besides just price. The freedom to use my phone (and data) that I've paid for is worth so much more to ME than price! As far as cs goes, well, that depends on who you get on what day and what mood they are in. To this day some of the worst cs I've ever gotten was from a postpaid provider (T-Mo). And honestly, the BEST was from my very last conversation on the phone with H2O! Yea, I said it... H2O! In fact, I told the guy I spoke with that if most of my cs was like it was with him I wouldn't be leaving.
As far as coverage is concerned, no provider anywhere has got it perfect so that's area dependent IMO. And speed? Not really a big difference (on a phone) in real life use between 7mbs and 3mbs. The .2 times faster your YouTube video loads won't hardly make a difference to you. Oh wait... ST says you can't watch YouTube with their service, my bad. RP let's me use my data however I want within my 250mb/2gb limit that I get. I can ever tether! But I'm just saying
So yea, I don't think ST has the better "overall" service between the two simply because of price. To be able to pick up my phone and use it when and how I want to is a far better experience for me!