Depends on your definition of "better"
VMWare is updated less often which means that it doesnt always have some of the cutting edge features(for instance you still cannot virtualize Lion on it yet), but at least in my experience it is significantly more stable and performs better to boot. However since I do not virtualize Windows, I virtualize Leopard Server and Linux, and dont do any graphics stuff on either platform YMMV.
Actually OS X Lion runs great as a guest in VMware Fusion. There are instructions easily found on the 'net which explain how to install it.
The process is fairly straightforward. Once you have built a customized Lion Installer image it is very easy to set up Fusion VMs to run Lion.