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Tbolt does simultaneous voice and data, over 4g and 3g, from everything I've read the Samsung Charge doesn't. Tbolt comes with a 32 gig card, not sure what the charge is packaged with. Charge has SuperAMOLED Plus screen, gorgeous, but the Super LCD from the Tbolt is nothing to turn your nose at, not the AMOLED plus though.
Samsung = notorious for not releasing software updates
HTC = one of the best for releasing software and also has a ton of community support behind it.
Comes down to personal pref though, handle both phones and see what you like, also take advantage of the 14 day trial period. I find that if I'm not doing heavy surfing or web browsing by using LTE On/Off and turning 4g off I get at least double my battery life. Also doesn't hurt being rooted with a custom rom and kernel.