Don't over think or stress out, slow down and take your time. You are about to invest a good chunk of change for some new speakers. There is no deadline that I'm aware of, so go back and listen again, and again. Take source material that you are very familiar with and listen.
When you feel confident that one sounds better TO YOU (don't listen to what the dealer says sounds better), buy it. However, be prepared for them to sound different when set up in your own room. Speaker/room interaction is one of, if not THE biggest variable in this hobby. Not to mention the fact that the dealer's gear is probably different from your gear.
Just slow your roll and take your time with this decision.