What's The Best PEX Tubing Size For Shower Valves?

EFIELD 1/2 Inch 2 x 100 ft (200 Ft) Pex-b Pipe/Tubing, 30 Pcs 1/2-inch Barb Crimp Brass Fittings, 100 Pcs Stainless Steel Cinch Clamps, Pipe Cutter

EFIELD 1/2-inch 2 x100 ft Pex-A Tubing/Pipe （All in One） Red & Blue 200 ft， 30 PCS 1/2" Brass Expansion pex Fittings- Elbow Tee Coupler (30 PCS), 1/2' Expansion Rings (100 Pcs), Pipe Cutter (1/2-inch)

Copper vs PEX Pipe: Make Sure You Choose The Right One! | 1-Tom-Plumber