What's the difference between 4derm and androgel?

I’ve read the topics on these things but what are the differences between
4derm and androgel?

what are the pros and cons of each?

You’ll find a fair bit of discussion on this in Jones’ post that started the 4AD hype.

As i understand it, Androgel is already testosterone, while 4AD is a prohomone - a precursor of testosterone that your body completes the transformation of internally. Androgel also requires a perscription, whereas 4AD you can find on the net relatively easily.