For most of the 1990s I was a huge user, and proponent for Kramer's MSP Paddle; I most frequently used it with my SIG P225, which was my EDC back in that day.
I gradually moved over to their #3 IWB, as it seemed to be a bit more concealable and comfortable. With a paddle, no matter how good (and Kramer's are some of the best, in my experience), there's still the feeling of the gun hanging out there as opposed to being an integrated part of your body, if that makes any sense. With the major exception of Privateer holsters, most of my holsters these days are kydex. Generally, I do not need a quick on/off holster option. If I ned wear options in a holster, I'd lean towards A 3-slot, which allows for cross-draw carry, which is particularly useful for in-vehicle carry/road trips, etc.
I'd still recommend the MSP paddle to those seeking that route, but I've personally gone in other directions holster-wise.
Best, Jon