"I am going to select either SuSe 9 Pro or Fedora core 1. What I need to know is which one is the most user-friendly and in which one will Kernel 2.6.3 be installed easier...."
I used SuSE for three years and then switched to Fedora Core 1. The differences between the two are minor. At the time I switched Fedora used later releases of all the software than SuSE. Fedora has tried to merge the Gnome and KDE desktops into a single theme called Bluecurve. I prefer the SuSE practice of leaving Gnome and KDE in their native state.
I don't know whether Fedora or SuSE will provide support for kernel 2.6.3 first. If you compile your own kernels then there is no difference in the ease of kernel installation between Fedora and SuSE.
You said that you are going to buy a new distribution. If you buy SuSE 9 Pro you get some support from SuSE. You get no support for Fedora whether you pay for it or not. If you pay for Red Hat you get some support from Red Hat.
If I were paying for a distribution I would buy SuSE. Since I use free distributions I prefer Fedora to the free version of SuSE.
Be prepared. Create a LifeBoat CD.