Yes 5GHz band is always faster. My Macbook Air and iPhone7 both get 220mbps on my Vivid200 wifi connection (and 220 on ethernet of course). However, on wifi, they only get that when I put them onto the 5GHz network. I have my own wifi router and have the as separate SSID's - you can do that on the Hubs too.
Sat in the same spot if I then flick them over to the 2.4GHz network, they max out at 50-60mbps (others on here get even lower [<50] on their set ups) - it's just the limitations of the technology!
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.