Erm, for my
worth I have tried both as well. Personal preference is for Mandriva, I found it generally easier to set up, with less hassle setting up repositories/mirrors for updates etc. SuSE is good, don't get me wrong, I just felt more "at home" with Mandriva.
Why not download and burn both, and see what you prefer. I just happen to use boxed set DVD from Mandriva. It has all those possibly inconvenient things (nvidia driver etc) already pre-configured and IMO is very suited to those who don't have much in the way of linux experience.
As they say on the game shows, "the choice is yours"!
Good luck, whichever you decide on.
regards
John