Pocket depth can definitely present a problem with longer guns like the j-frame.
This is exactly the reason why I quit buying 501's (and other brands too)...not enough pocket depth. The pockets seemed to be too tight as well. I only buy jeans that fit my pocket holster
and grips of choice and that's important because I wear jeans 99% of the time. So for me it's almost always a Mika that ends up in my pocket (round or square cut), even though it's a bit bulkier than some of the others. The draw NEVER requires a thumb push or wiggle of any kind to get my 642 or old Charter Undercover out of my pants pocket.
But...
I also have pocket holsters from Desantis, DM Bullard, Uncle Mike's and RKBA, and they all have unique features that make them useful.
The Desantis Nemesis (not shown in the pic) is open-bottomed, and lets the gun sit lower to better conceal the grip, but I have trouble drawing the Charter from it on occasion. The hammer gets stuck on the sewn lip at the top of the holster. It also sometimes requires a thumb push with my 642. It gets used the least of any of my pocket holsters.
The leather DM Bullard feels good in the hand and is small enough so the gun sits low, but it's boned (which makes it print a little) and relies on the hook at the front to keep it in the pocket during the draw. I don't like that.
The Uncle Mike's is a handy and inexpensive little holster that also allows the gun to sit lower in the pocket. I use it in some of my jeans and shorts. It was the only pocket holster I could use with 501's. In larger pockets it sometimes comes out with the gun. YMMV
My RKBA (not shown in the pic) is used a ton during the winter months in the inside breast pocket of my ranch coat. It's boned and doesn't have a hook at the front, but it stays put during a draw, so it's a keeper.