I like me a good Gibby. That said, there is nothing special (to me, no disrespect) about a J200. Nice, but lots of em around.
The Taylor 900s, OTOH, are quite a bit more unique and special, particualrly the pre-NTs. This in itself is no reason to trade for it if one doesn't care for the tone and the play of said 900. But if you're talking about buying sight unseen, I think your chances are excellent given the 900 sets the tonal and quality-build bar pretty high.
Edward