Same dealer or different dealers?
If it's different dealers, which shop's people do you like best? Who would you rather talk to for advice, service or if you have a warranty problem? Buy whichever brand bike they sell.
If it's the same dealer, which color do you like best? If every time that you look at your bike you think "I wish I would have gotten the other one" that would be bad.
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.