That's really up to personal choice. I like the Sabertooth better myself, but that's just because I like the way it looks.
If you need a board with onboard WiFi and PCI slots, go with the P8Z77-V, otherwise the Sabertooth is basically the same besides the number of USB ports and headers.
For OC'ing I would choose the Sabertooth Z77, and just looking at that side-by-side the Sabertooth can support at least DDR3-2666 and the QVL lists DDR3-2400 kits.
As far as WiFi I really do not recommend WiFi for Desktops and instead CAT-5e/6 or PowerLine.