i'd lean towards recommending the sony for you.
the only things holding me back from saying the sony is definitely better are:
-I've never actually compared the two, I've only seen the jvc
-I have my jvc on it's dimmest setting, I still find it more than bright enough, so even though the sony is brighter, that may or may not actually matter to you
-while I never paid any attention to the lens memory before, i'll never buy another projector again without it now. it's made me want to buy a new 2.35:1 format screen so I can use it more often
but the reasons I think overall you PROBABLY should go for the sony:
-with a bit of ambient lighting, and a light colored room, the jvc does lose some of its impressive blacks. since buying the jvc I've done a lot to reduce the level of light in my room. it may not be necessary to get a good picture, but it might be necessary to see the difference between the jvc and sony. and this is really the only area where the jvc beats the sony
-the sony gives better motion performance, less input lag, and a brighter image.
-it costs less, but should give you pretty close to the same image quality in 2D, and better in 3D(just in case)
I had to choose my projector without demoing either, and I opted for the jvc over the sony mostly on price. the jvc was about 800bux cheaper for me.
Displays: Samsung PN64F8500/JVC X35
AVR: Pioneer VSX-1130K, 7.1/5.1.2 audio
Sources: HTPC(Enby), PS3, XBOX360, Wii
Control: Harmony One