OK Some some device comparisons...
DNA200 / 75, The most accurate TC available so far with a smooth signal and none of the PFM flutter that other types often exhibit, steady consistent Wattage mode delivery.
Yihi SX350J, Usually runs a little hot in TC and can give PFM flutter at higher TC Wattages or when fine controlloing TC, does give a nice steady wattage delivery.
Evic Mini, reasonable TC, sometimes a little inconsistent but good overall, steady wattage delivery.
RX200 / 200s, as with the Evic mini hardly suprising since they're based on the same Algorithms.
Snow Wolf, TC is a bit flaky but mostly ok whilst wattage delivery goes over to PWM above a certain power output - could be better
SvoeMesto Semovar SM3 - reasonably solid little 20w tube mod, unfortunately way out of date now but was pretty much the benchmark for it's time
Vamo - lot's of peoples first regulated device, cheap cheerful and mostly accurate - again way out of date but pretty good for it's time
Smok Xcube2 - The Marmite one, some people swear by it - having used DNA mods I just swore AT it, lasted a whole 2 hours before I put on a shelf never to be used again.
Vaporflask DNA40 - like all the DNA40's it was a benchmark device at the time, early production problems caused it reputation problems but it pretty much left them behind and was the go to chipset until the DNA200