Power Meter Advice - Stages vs 4iiii

Looking to pick up a GRX crankset and looking at a factory install of either a Stages Gen 3 or 4iiii. Stages is cheaper with the USAC discount by $60. The other option is a Power2Max but that’s about double the price. What is the current thought about Stages vs. 4iiii vs. P2M? I can get a GRX crankset for $120 at REI with my dividend/discount, so around $360 total for the Stages, $420 to go the 4iiii route, or $670 for P2M (with chainrings).