Several things to think about:
1) what is your budget? If you need to keep the price as low as possible, then go with the option that gives you the most bang for the least bucks.
2) Does the local dealer offer training on how to use the Q'nique on the frame? How to put the sandwich on the frame, how to measure the quilt and the pattern for the best outcome? Does it include leaders? Is it computerized? If it's not computerized, does it include a stylus for pantographs? Does it include any pantographs, rulers, etc.? Do you have any options on a frame size if you buy used? If you get a 10 or 12 foot frame, but only have room for an 8 foot frame - well you see the problem.
3) Will the dealer at the show offer free set up as well? What is the warranty on frame, and the machine if you buy new at the show? What does the dealer at the show offer in the line of training? Is the setup the show dealer is selling computerized? Does it include leaders? What, if any, extras does the price include. What frame size options do you have with the setup?
As for the quality of Q'nique, no one I know has one, so can't comment on that.