True, they are all fast, and normal care should be taken.You can look at several burn rate charts and see the fastest ones rated a little different. But they are all fast. I prefer titegroup because several other shooters I know use it and having a "powder support group" is good for bouncing info back and forth. No horror stories with it.
Clays I have heard alot about both good and bad. One powder I have heard nothing but bad things is 700x. Too many other good powders to choose from.
I actually like 700X, even though it doesn't meter great, and am not a fan of Titegroup, because of the tiny charges, but we all have our preferences. Lots of Titegroup fans and 700X detractors.
I have found Universal to be very clean to extremely clean in any reasonable application. It's good stuff. Good enough I bought a 4 pounder. Clays is very clean, but very fast, which limits it, but no more than other very fast powders.