Just to broaden the horizon...Uphonor has been selling their expansion pex system for decades and it also works well. No crimp rings, larger diameter through the fitting, and the most flexible pex that bends into the smallest diameter and is repairable if you kink it during install without cutting the section out and installing a fitting (how's that for a run-on sentence!). The expander tool is not inexpensive, and unless you get a powered one, your hand and arm will get a good workout (you might be able to rent one or buy it and resell). It's harder to get the tool into small spaces, but you do have a few seconds to insert the fitting before the tubing collapses to make the seal, so usually you can plan ahead and not have problems. Pex has a memory and always wants to return to its original shape. By expanding it, when it tightens onto the fitting, it will always be trying to make it tighter. A crimp system is working against its natural tendency. On a crimp system, the fitting must be small enough to slide into the tubing. On an expansion system, the fitting will not fit in until you've stretched (expanded) the tubing. Then you put the fitting in, and it collapses to make the seal. Really neat, clean, and reliable.
Pex is manufactuered using three methods -A, -B, and -C and -A tends to be a bit more expensive (and flexible). As with anything, quality control is critical, and there have been issues with any. Pick a good manufacturer and you should be fine with any type.