I've happily sticked to Assos for years and while trying something else every now and then.
Tried Castelli, but the chamois wasn't for me. Apart from breaking twice it just didn't sit right and the brand logos aren't durable material, which make it look messy after a few time in the washing machine.
Rapha pro team (thermo) seemed okay, but a bit too loose on the ass side when not in the saddle (traffic lights etc) and then started moving a bit. But nice big chamois.
Still undecided on POC, I got 1 of their bibs but it's not one of my "first to grab" because it's a bit love/hate relationship. I got rides where it sits perfectly but then other rides where it just won't. And the bibs seem a bit shorter then the usual. Also weird fitting. Got a size S from them while all my other bibs are M. M might have been better on my legs, but then I would have been too big/loose on my upper body.
Bought a Isadore (the standard version) this spring, didn't love it at first, chamois was a bit too hard, but after wearing it for a while I love it. Fits nice (subtle all black design, even brandlogo), might be a bit longer then my other bibs, but not noticeable longer. Still in perfect condition after crashing in a wet corner on the tarmac. Another + is the price, not as expensive as most brands.
My next up will be Sportful Fiandre No-Rain, interested in how it fits and how well the no-rain works and is allot cheaper then Castelli's Nanoflex.
Been thinking about a pair of navy coloured shorts myself as well. But haven't found any worth trying. Maybe Lumiere or Maap (Ausi's seem to like navy) but the prices are crazy and then I still need to get it to Europe.
If u go Kahki you might as well go full (ugly) AG2R brown