I pretty much stick to the CAT tourniquet as my preferred tourniquet. Like Max D, I have a bit of practical experience applying and re-assessing multiple tourniquets on patients. I have broken a CAT on someone before, but it was also previously opened and I have no idea how much it was abused. I've played with, trained on and used the SOF-T and SOF-TW but am not a fan. I can appreciate the metal windlass, but am not a fan of the set screw or windlass clasps. I've played with multiple tourniquets, many of which I forget their names. I've seen the "Ranger Ratchet" which has a 99.9% success rate (will find supporting documentation somewhere in my pile of medical stuff). SOF-T, SOF-TW, NATO TQ, some roller blade strap looking one, BP cuff style, CroC, JETT, Elastic Tourniquets, RATS, Belts, Speakerwire, I've seen a lot. I just stick to the CAT, applied correctly should have no issue. During training I am lucky to get more than half a turn before someone complains it is too tight.
One product I can't really get behind in the "RATS" tourniquet. I had made a post on another forum before about it but am admitting to laziness and not searching for it. I understand the idea behind it, the USMC attempted a tourniquet similar with a hook connected to a elastic material. Singapore medics also use a similar design, except theirs is thicker and wider. I feel it has the same type of application that an ace wrap has. I just don't think it is a great tourniquet. Better than nothing, but not what I would want my life to depend on.
I don't EDC any type of medical gear on my person besides chapstick when I am stateside, so maybe I am among the few oddball medical providers.