We've done several splits between the two (most recent being this summer with BC (same food as YC) and RPC (same food as SL). As far as pools go, we really like the ones at the GF, but they don't compare to the one at BC/YC. As far as the food went, in 2016 we actually preferred the food over on the Epcot side, but this past trip I have to say that the food was better at the GF. There were more options, more services (tea in the afternoon), more nights with a chef plating amazing (really) stuff during the evening apps, and also they had bottles of water we could take to the parks.
Now if the slide pool is closed at the GF that might make a big difference to you. And SL is kind of a small lounge. But honestly if you don't want to be around dogs I'd consider switching if it's that important to you. The other factor is which parks you plan to spend your time at... if it's mostly at the MK, I'd lean towards GF. And if mostly Epcot then you can't beat the YC/BC location.
Good luck with your planning!