src.conf question

[Robert]

Greetings

I will be upgrading my main desktop system from 8-stable to 9-stable
this week and am quite confused with regards to Clang vs GCC. I have
complete backups and will be doing a complete re-install.

I have seen several different examples of what to put
into /etc/src.conf and /etc/make.conf and am not sure if it is safe or
even advisable to make the move to Clang for source and ports.

Can someone help with this?

Thanks in advance

Robert