The RCDS trim pro is a great system, especially if you buy the three way cutters for each caliber. There is really quite a bit of set up to make perfect cuts every time you change calibers with the system.
The Lee system has no set up. the measurement is already built into the guide pin specific to each caliber. I spin it with am electric screwdriver so it is fast and easy. Not as perfect as the trim pro, but by the time you get a trim pro, shell plates and 3 way cutters, a couple $100 bills have disappeared, the Lee ssystem will get you going pretty cheap. Good Luck
I'll also recommend the Lee trimmers. Not that there aren't better or faster trimmers out there, but you said your just starting out so I would get the simplest, most reliable system out there and that is the Lee set up. "So easy a caveman can do it", and It also happens to be quite affordable.
You need to either get the cutter with the wooden ball on it, or do what I did and wrap tape around the standard one until it fits your hand nice. I would go ahead and get their 3 jaw chuck with the power driver attachment. That screw down shell holder doesn't always work to well.
It is true that after a while, the stem will wear and will have to be replaced. It seams to happen all at once, so I assume the stem is case hardened and once you finally get through the hard part they wear fast.
After you've reloaded for a while you might want a faster set up, but I still reload about 150 308 cases a week with lee trimmers. In fact I just did 100 a little bit ago. Trimming, deburrning the flash hole, chamfer inside/outside and deburring them took me right at an hour. I do this all while its still chucked in the cordless drill.
I use a Wilson and love it. Got the power adaptor for volume .223 trimming.