JM Custom Kydex AIWB 2.5 or a Vedder Pocket Locker. Both work well for my P365X.
I've found that for carry, I prefer the original OEM grip module (it is lighter by 1.7 oz (for me, I have the weights), and a bit thinner than the WC. For shooting, definitely the WC; the grip texture and shape suit my size M/L hands better, and I like the small magwell they molded in. Not that I'm shooting the P365X in USPSAl; waiting on release of the 3.7" Macro for that.
Both holsters work for either the WC or OEM grip modules; the retention around the trigger guard is identical in mine.