I am the least qualified person to answer, but They are very...

I am the least qualified person to answer, but

They are very different for starters

Don't know anything about RAD, other than it is doing imaging or something

CHM is chasing the big buyout, that's the end goal financially. 100x to 200x upside on current SP.

CHM is chasing treatment for a large range of very harmful and nasty diseases, that's the human goal.

Above is not financial advice.

Would be better to take two meaty dog bones and write CHM on one and RAD on the other (with an edible, dog safe ink of course) and let your dog decide.

Tie him to a post, let him / her sniff the bones, and put them at equal distance from him/her.

This is also not financial advice.