The eGo-c would be a better choice. While I didn't have many problems with the t, many here reported leaking problems with the t. It seemed to run hotter and hot ejuice loses viscosity. Many solved their leaks using the silicone 'soft caps' on the tanks.
The eGo-t attys are not 'modular' like the eGo-c. If an atty goes you have to buy a new t atomizer - @$10-12. With the eGo-c, if the coil burns out, you only need to replace the 'atty head' - a small unit that contains the coil and connections that goes for $4-5 each.
Also the batteries on the eGo-c have new and improved (actually

) short and charge protection. The 650mAh batt will give you about 6 hours of
vaping - ymmv. The 1000mAh will give you @10 hrs - ymmv, however the length on the 1000 is considerably longer than the 650. There are 900mAh - 9 hrs - available at some vendors but again, get the Joye eGo-c version. It's only a bit longer than the 650mAh batt, and only one hour less than the 1000 - if you need more time, imo, the 900 is the better choice for length and balance. They're harder to find.... I still prefer the sleeker look of the 650.
The attys come in two types 'type A' - which is 1.2ml in volume and cone shaped,
https://www.cignot.com/product_p/kit-egc-all.htm
and 'type B' which is 2.5ml in volume and cylinder shaped.
https://www.cignot.com/product_p/kit-ebc-all.htm
There are other vendors but with the eGo you want to get the genuine 'Joye' product. Clones don't have the new batt protections and in most cases are inferior in some manner to the Joye. Cignot is a Joye vendor.
Also suggest starting with the SR (standard resistance) attys 2.2Ω vs. the LR (low resistance) attys 1.8Ω
recommend getting the standard resistance attys to start, not the LR's.