Great point. I probably posted this prematurely. I've only dabbled with the presets of each thus far. The PCM was in a California professional studio, so I supposed I should check the user presets, too. Probably a lot better than I would be able to do, especially for the time being.
NL5 called it out a little, too. The LXP-15 halls, though I think it sounds great, are not as spatially believable as the PCM, though both sound really good. But I'm not really looking for big halls on my drums. Maybe 20 years ago, but definitely not 30-35, and that's kind of the sound I'm after on drums. I'm thinking the PCM will be set to "real hall", or some user derivitive thereof, for an ambience background effect, some more channels than others. I'm going to bus the drums on bus 1 and 2, so maybe I'll keep one of the LXP presets, be it factory or user, on those. The LXP just sounds better to me in the presets for drums so far. Keeping in mind my drums are not very dry to begin with(my room is a a room-within-a-room construction, RealTraps in the corners, Auralex Metro 2" placed 2' oc up the side walls, 4'x6' in front of mix position, 4" pyramid on the back wall, peaked ceiling, concrete floor and wood ceiling so still quite "live" because I track in there too), and maybe that is a little piece of the reason. In other words what I've is that the PCM adds a lot of "space" to the sound, while the LXP can be maybe not quite as believable. Therefore, I'm like the sound of the LXP on short reverbs like plates, where if the tracks were bone dry I may be inclined to favor something spacier. When I get to messing around back there again, I'll post a couple of different preset flavors from each. May not be until this weekend as I'm a part-timer.