Sorry you haven't had any responses. I do have an AutoPilot that I run my pump through, and it is a nice feature as my old timer motor is shot. Either cell is sufficiently oversized, as is recommended for your pool.
The T15 makes approx 1.45 lbs/day of chlorine vs 1.28 lbs/day from the RC35/22 (SC36)...so theoretically the T15 will last a bit longer.