We have both the Watts Pex and the Uponor systems. I have never used the Uponor set yet but I'm trained for it. Main reason I did it was because it was free to get trained through our plumbing supply house and now we have the tools and plenty of fittings for if we ever run into it on a job site. I prefer the Watts system with cinch rings as it is easier and faster to make the connections. I've never had a connection fail with the Watts system.
Good luck searching for the expansion tool to use. Their expensive and not too many people will loan them out. If I lived near you I would let you use ours since all it does is sit on the shelf but I prefer not to mail it out as I know as soon as I ship it away I will need it and your a little too far away for me to drive over and pick it up