Hi and welcome! There are scores of literature on ECF as well as SG Vapers on
tanks, cartos & attys.
EGO-C is only a variation of the EGO type PVs. There are standards that different manufacturers follow to ensure cross compatibility so an EGO battery will likely accept anything that uses 510 type threads.
As the name PV suggests,
vaping is down to personal preference. So it's good to do some research and try out the different products to find what suits u. Some swear by clearos and some live and die by dripping. The Madvapes Knowledge base is a good place to start reading up on Ohms and the Watts.
As usual, have a nice day.