This was just brought up in another thread in this forum. In short, here are the main differences between prop and enth:
Test enth: Greater increase in protein synthesis, per mg.
Test enth: Increased conversion to estrogen.
Test enth: Slower release rate.
Test enth: Contains less testostrone, per mg.
Test enth: Possibly reduced conversion to DHT
Test prop: Lesser increase in protein synthesis, per mg.
Test prop: Reduced conversion to estrogen.
Test prop: Faster release rate.
Test prop: Contains more testosterone, per mg.
Test prop: Possibly increased conversion to DHT.
In the text below I re-posted a post of mine, which I had originally posted in another thread, as it applies to the OP.
"There is a lot of confusion regarding the effect esters have on testosterone.
Sure, test is test, but esterfied testosterone is not just test...it is esterfied testosterone. There IS a difference. Contrary to popular belief, the attached ester makes a difference in several ways. They effect the metabolism of the testosterone molecule and also causes variances in protein synthesis rates. They also effect the testosterone molecule in more well known ways, such as differences in absorption rate rate and the percentage of testosterone contained per mg.
Usually, all we ever hear about is 2 things: How they effect absorption rates...and the amount of testosterone contained per mg. Naturally, many assume that shorter ester will deliver a greater muscle building effect, due to the greater amount of testosterone per mg, but this is not so. Research going all the way back to the 30's (and which continued for many decades afterward) clearly shows that longer esters result in a greater increase in protein synthesis than shorter esters. In other words, longer esters are superior for growth, per mg of testosterone injected. If memeory serves me correctly, a 200 mg injection of test prop increases protein syntheis slightly under 200%, while a 200 mg inject of test enth increases protein syntheis into the mid-200 range. Every single subsequent study has shown longer esters to have a greater positive effect on protein synthesis. However, it is understandable why people would think shorter esters provide more bang for the buck. Not only do they contain more test per mg, but they frequenly provide quicker intial results. In light of this, the false belief that short estes are more potent is further strengthened.
Longer esters are aslo more likley to interact with aromatse, due to their longer time in the body. This is why long esters promote a more watery look compared to test prop and may possibly even be a contributing factor in their ability to elevate protein synthesis above was is witnessed with shorter esters."