Personally, I enjoy both the eGo-T and 510-T. I don't use them all the time anymore, though they used to be my go-to kit. Note that you can use the 510-T atomizers on any 510 battery, so if you go that route I highly recommend you go with a good long-lasting battery rather than the cigarette-sized 510 batts (the 1000mAh eGo battery is a good choice). The battery life on those ciggie-size devices is pretty poor (usually around 240-300mAh)
I'll break down a couple of differences between those atomizers from my experiences:
- flavor and throat hit come through a little better on the 510-T than the eGo-T
- eGo-T carts hold about twice as much juice (the Mega/Type-B Tank attys hold even more) as the 510 version
- the draw is stiff on both models, some people like it and some don't
- the 510-T is less prone to leaking issues than the eGo varieties (just my experience, though, YMMV)
I'd recommend the Tanks to pretty much any newbie, but there is a bit of a learning curve (like with pretty much anything) on how to adjust your vaping style to get the best performance out of them. Once you've gotten past that initial hump, though, it's smooth sailing
Hope some of that info helps you!