Never done them together
i did T3 while on cycle once and am currently doing clen as part of another. So far the clen has yielded far better results than the t3 did. I was very careful with the t3 tho. Never exceeded 75 mcg ed.
The clen is mobilizing way more fat when doing cardio and my cycle keeps the muscle all there. I don't think i ever tried anything better for fat loss than this.