I guess it depends what you're looking for, they're all excellent and give results. The major difference is whether they are more strength geared or more endurance and also whether they are total body or splits.
PH...fun, fast-paced, time flies, endurance oriented, total body including abs
CTX UB...more endurance oriented, but very tough and one of my favorites. I feel drained after this one. I oftentimes will split this one up into back, chest, shoulder and then bicep and tricep on another day.
MIS...more endurance oriented than strength in my opinion, but short and sweet and easier to break up into separate lower and upper body days than something like PH
Pure Strength...a split set, slightly lower rep speed so more strength oriented. Great floor work in the leg workout too.
Leaner Legs...killer, more endurance oriented, great ab section.
S&H...great, but for me require alot of focus so I dont do them too often.
Something to think about! Let us know what you decide.
Stacy