Typically, longer esters have a higher concentration of hormone in it, but it is absorbed slower. I have personally used both long and short esters, and the effects of 100mg Test Prop eod is roughly equivalent to 500mg test E every week...
I prefer long ester, personally....I dislike being a pin cushion. The problem with long esters is that if you have a bad reaction, you have s longer wait until you are clean. The benefit is: if you are unable to pin on your regular day, the longer ester will help keep your levels stable longer, rather than crashing