I'd be curious to know how much water expands under freeze vs how much PEX is compressed at a crimp fitting. It's not the same kind of force but the relative magnitude might be interesting.
Matt Risinger (austin-based homebuilder) did a freeze comparison between copper, pex, and sharkbite fittings some time back. It was pretty interesting.
At this point, I'd probably go for PEX-A (compression band) over PEX-B (the crimp style) because of the risk of getting the crimp not completely correct.
