There are more than 3 systems.

For a small job just use shark bite fittings. If doing a whole house pick a system then buy a battery operated tool for that system. For multiple reasons, easier, faster, better crimps, the biggest reason the hand tools don't fit in tight places.

Wirsbo or Upinor is the best, IMHO. that is the one you expand then put on the fitting and it shrinks back on to the fitting. I recommend the Milwaukee expander tool you only need the expander head for the pipe size you are using


The cheapest way is the stainless cinch (Oetiker) rings, the same tool works for all the sizes. These are the only ones I've seen fail.

Then there are the ones that use the copper rings. ASTM1807

Then the ones with the stainless collars on the fittings. PUREFLOW

Also alumapex uses compression fittings.

This should help
Types of PEX Fittings and Connection Systems