When I carry a J frame it's usually my 342PD w/ a Big Dot nightsight other times it's the 340M&P.
If I feel the need I require an N frame, it's the 325 Nightgaurd.
Hard choice on just one selection. I own a Model 60, 649 and a 36-1. From time to time I carry each of these. And it's not uncommon to have one on my hip and one in an ankle holster. My favorite is the 36-1, 3 inch heavy barrel, round butt. All have found their home
340 PD. Also have a bunch of other J frames that I sometimes carry, as well as half a dozen Colt D frames. I like some variety in my life. Like the weight of the PD though.
This Chief's Special (Pre-model 36) has ridden many miles....some before me.....now it rides in a 'Old Man Carry Systems Inc' tactical red bandanna. Also shown is a raggedy Benchmade that my wife bought for my birthday many moons ago