While I think the Contemporary has more of a convenience factor...I think there are aspects to both that may help with your decision.
If you plan on pool time, which pool do you like better?
Do you have ADRs at either one that might make a stay at one or the other better for getting to meals?
Have you looked at the room décor? Does one grab you more than the other?
Which do you think might relax you more when you come back at the end of a busy day?
No big deal, but considering how easy it is to get to one resort form the other (as well as the Poly), I wouldn't let ADRs be as much of a factor. And if you have ADRs anywhere else on property, I feel like both resorts are relatively easy to get to where you want to go - with GF, hop on the monorail to MK, with CR, walk over to MK, and bus to your resort of choice.
Register on WDWMAGIC. This sidebar will go away, and you'll see fewer ads.