I also own Soliloquys and love them, but I've also heard the Vandys and they're very impressive too. I found the Vandy's tweeter to sound a bit more laid back, but that's an area of personal preference/system matching as much as anything. The 6.3s are large speakers and need a lot of room behind and around them to open up and to not overload a room, which may be a consideration.
If I were you I'd go listen to Vandys somewhere with your music, and if you really like what you hear that might be the way to go since Soliloquy is basically out of business. If you ever have touble with the speakers or need to replace a driver it could be a problem. Best of luck.
