Ps4 and XB1 on order - which one to cancel?

E3_sony_vs_microsoft1_medium

I have a launch day PS4 and XBox One on order. I don't want or need both so which one do I cancel (or more likely sell on Ebay/CL to pay for the one I keep)?

I'm a casual gamer, adult, I have an always on internet connection, but I don't even have a whole lot of time for games.I mostly use my TV to watch movies using Netflix, Amazon Prime, Plex and both the 360 and PS3 support DLNA and I'm sure the new ones will, too.

So which one do I keep?