For me, the 5ghz is really important. I work on products that only use the 5ghz (because of interference and crowding @ 2.4 ghz). Also, I am not en expert, but the chipset now used on the RPi will have an easier path to FCC approval?

"This has allowed us to certify the entire board as a radio module under FCC rules, which in turn will significantly reduce the cost of conformance testing Raspberry Pi-based products."

I think the Rpi is one of the few SBCs that have 5ghz support on the board.