I have not experienced any issues with bullet jump in over 500 rounds fired. The ammo used was a mix of defense loads including +P+ from 115 to 147 gr, factory fmj from S&B, Rem, Fed, Winchester and some commercial reloads. I get that it is a potential problem but not one I have experienced.
Recoil can be stout but I also shoot a S&W 640 and 638 , in comparison the LCR recoil seems less with full house defense loads. The LCR is built on the 357 frame.
The moon clip holders that I use are much less bulky to conceal than the J frame speed loader holders in my experience.
As others have mentioned the LCR trigger action is much better than the J frames.
One thing that hasn't been mentioned yet is that the cylinder on the LCR 9 is cut to headspace on the case mouth enabling it to be fed individual rounds if needed due to problems with a moon clip or to reload it from a 9mm magazine. Ejection may have to be done with a pen, pencil or similar type of improvised ejector though.
For me the LCR 9 is a keeper and provides a good companion gun for my 9mm bottom feeders.