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prop = less sides because gets out of your system faster.... faster gains all that good stuff.... en = stays longer inside more prone to sides and slower kick in til week 8ish or so... if ur friends are not in pain then they didnt get quality or maybe they are lying to you... legit prop usually gives some type of discomfort.
and bro, do more research these are basic fundamental questions man.
Hmm for the most part id say your right although I know 2 people that produce an amazing test p that are completly painless..
And to the original poster the pain will be dependant on what type of oils and grade of powder the chemist used and your tolerance to said product. Some people have different reactions to different oils.
-Eric
