I'm new to vaping (and the forum as well) so welcome =)
Personally, I prefer the iTaste vv & TS3 setup to the ego but ymmv. They seem to cost about the same, the vv has more variations, and the real win for me is the usb powering - can plug in pretty much anywhere while vaping without having to disassemble. Also, it's threaded to accept, what appears to be, most major tank styles.
The TS3 fit the ego twist I know, that's what i bought them for to begin with - not sure about the T2/ego combo but I'd guess that they fit also. The vets here know far more than I though.
So far I have tried the eGo twist (4 different ones actually due to failure/breakage), a shorter eGo (forget model) and a, iTaste vv for batteries TS3 and ismoka bcc for tanks. I personally prefer the vv/TS3 combo right now. The only fluids I've tried so far are from local shops here in Phoenix so I don't know how helpful that is.
Hope my noob knowledge helps some.