Gear clamps (hose clamps) should never ever be used on PEX.
Copper crimp rings work great and are very easy to use but the required crimper is expensive for doing just a handful of crimps.
Sharkbite fittings will work fine but can get expensive if you need more than a few.
I would suggest using cinch clamps like the factories typically do (as in photo). You can buy them as a package of clamps plus the tool at HD at a pretty decent price and you can have some spare clamps and the tool to keep on hand for future repairs or mods.
You might want to buy a stick of PEX and also a PEX cutter so you can make nice clean cuts. If you get cinch clamps, get some brass PEX fittings.
