Hi Stokie,
If you search 'Zoladex v Prostrap' or 'Zoladex and Prostrap' you will find that there have been long discussion strings on this site comparing each alternative.
Personally, at various times I have been on both, and to be honest can't really say one was any better or worse than the other.
I can't help with Radium, but I am sure someone will come back to you.
:)
Dave