Know this thread is getting a little old now, but SPL offers so much more than SAM can provide. Unless you are into building a bunch of scripts for SAM to work how you want, SPL is pretty straight forward and easier.
Still, SPL can be as complicated as you want. My setup is crazy, but I like what it's capable of, so go to lengths to make it work the way I want. I'm constantly tweaking it when needed, and will admit, becomes a big deal when I do.
The program is great though, and the support is superb. Ross is always on top of it.