Backplate or Jacket

[LKunze]

I guess I haven't tried a jacket again since I switched to a BP/harness 7 years ago.  For me the biggest pros of the BP/harness over the jacket are:
1.)Less clutter by not having anything wrapping around the front of the torso.
2.)Better horizontal trim. Jackets as I recall tend to be more prone to keeping you heads up like a life jacket.
3.)Clipping off lights/SPG etc. is more practical than on jackets because the D-Rings on jackets typically aren't adjustable. 
4.)The crotch strap is key in keeping the rig secure on a BP/harness as well.  I always had a problem with the jacket riding up when going slightly heads down. And if rolling left to right the jacket seemed to move.  It was never secure enough for me.
5.)The tank seems to be much more secure on a harness. When standing up on land the tank tends to sag way down from the weight causing the jacket to ride up in the front.  Not really an issue in the water but none the less I like the better stability that the BP offers.