Enan is used pretty much as a "convenience" on long cycles b/c you don't have to pin it as often. Same with Cyp.
Prop and suspension are both more common with more advanced AAS users. Quicker results, most people say more powerful*.
*they would be more powerful mg/mg because The E and C in Test E and Test C both take up a certain percentage (I think 1/4 or something) of the molecular weight. Therefore, if you have 1000mg of Test E, you're really only getting [a theoretical--if my numbers are correct, which they probably are not] 750 mg of Test. the prop ester is small and test suspension is just testosterone base (pure test) in a water solution.
the shorter the ester, the faster the results and the more frequent you have to inject.
i.e. it is not uncommon to see someone using test suspension in a pinning 2x/day routine.