T200 is more reliable but I have driven mine at 12v and too much thrust, so I dial it down to lower voltage to keep them at desired speed,also, holy moses some of these take a lot of current, the Hydromea Diskdrive 50, which looks awesome, at 12V draws 15A. Sheesh! That means one powerhead... per breaker in your house. Brutal. I think the T200 is more less power hungry (but rats the diskdrive looks so cool).