I have not used either of these (and wouldn't).
Some guys Seem to use it without any Apparent issues.
But one thing is certain: Some guys who use it wish they never had. And Some of them say they are never the same again, after they use it. There are communities of guys that get together to discuss their experiences. You know how these things go: Some of those who have used them, and ever had any apparent issues, will say, "Hogwash! I've used it, so has Joe Blow, and we're both fine!"
I'm not saying they're not.
What I'm saying is that for the horror stories that I've read and heard from guys, it would never be worth it for me to try it (except possibly for life threatening Cancer treatment).
If you use it, and are happy afterwards, I'm happy for you.
I just wanted to share a word of warning about possible effects.