Agree with Yinzer, why not get one of each and see whiy you prefer? That's the bottom line - what I prefer may not be what you prefer!
Rebuilding any but the original T3 (i.e. the T3S) is about the same. I don't think it's a matter of quality, but of design. The original T3 was a bit more of a hassle.
And I've found that replacing the flavor wicks after cleaning and dry burn takes care of the leaking - I use a strand of cotton yarn, trimmed to fit. Results vary about taking out one of them. Some, like Freya, report good luck. Others say it makes them leak. May depend on
juice viscosity,
vaping technique and other variables.
Any container of liquid, with a hole in it, is going to have some issues with temp changes. As the liquid expands, it's going to pressurize the vial. Bottom
coils may have more of a problem with that, since the hole is at the bottom!

I haven't found it to be a problem, just unmount it from the battery, upend, and blow gently through from the connection end to clear it. (Into a suitable vaper towel, of course!)