Tier 1 commercially makes the best sidecar Kydex holsters IMO I have dealt with clones that are better quality though.
I like hybrid holsters better comfort wise myself so I say black arch Protos m is my favorite but I believe there is more innovations left in holster niche.
I’ve fallen in love with Blackpoint for my larger-framed carry guns. They make the thinnest profile that I’ve used. Really comfy. Kinda pricey, but the comfort is worth it to me.