I am new to Linux, but have tried both, here is my experience:
(Sorry to use this forum as a BLOG, I will not make it a habit)
I started of with Mandrake 10, but had ISO CD problems, did not like the club idea much, and thought that the German way of doing things would be more straigtforward then the French. (I changed my mind later)
I liked Suse 9.0, because of
-the internet install, an Iso Image of 350Mb and the rest from the net, I find this really neat and feel all soft should be installed like this.
- I have not seen any hardware (except DSL modem, see below) on my PC's it did not detect including my Canon camera.
I found the much acclaimed YAst confusing. I could not figure out the interaction between the DHCP server and the firewalls (there are 2 different ones) I had YAst/DHCP/Newbie problems.
I live in France, and use a Sagem USB modem, the drivers for this are "special" although many people try to make the thing "acceptable" I got it to work with SUse but it would not start up on boot, which is what I need. (prob confirmed by a driver config message)
I have been running IPCOP with my funny modem without problems for a year and still miss some aspects of it (web interface, stats)
I passed briefly by ClarkConnect, which has exactly the functionality I was looking for, plus a nice Web interface. but I could not make it work as a gateway (V3.0 just new) and got 0 replies on their forum (well 1, abt double posting

)
I remade ISO copies of mandrake 10.0, and once I figured out that the CDROM drive of the old Compaq P350 box would not read CD's of more than 650mB (SuSe and W2k OK) got it installed:
What I found:
Mandrake 10 seems considerably faster than SuSE 9.0 both with KDE. (not an issue on anything >1Ghz but appriciable on a P350)
Mandrake Control Center is more straightforward than Yast to my way of thnking; I find things where I expect to find them.
It did not find the sound card (a weird motherboard thing) and does not offer solutions
It does not detect my camera (not really an issue)
It supports my modem and boots with it.
Adding software seems more complicated. (I am trying to install Hylafax, need Sendmail and got stuck in dependencies; lib** things)
Mandrake seems to have a more reasonable (smaller) selection of installed soft for a newbie.
Having 3 install CD's while there are 4 is annoying. (I do not like memberships or paying for try-out things.)
The help seems more to the point.
It is blue (easier on the eyes than SuSE's green)
Biggest advantage it does what I want it to do.
I suspect that SuSE is the better product for any-one with some Linux experience but I am more comfortable with Mandrake for the moment.