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many also use tplink 9980
The 9970 and Billion only have 2.4Ghz wireless, but if 5Ghz isn't important to you, Amazon have the TP Link TD-W9970 at £33 at the moment. Bargain!
I have been perfectly happy with my TP Link TD-W9980
So none of them use 5 Ghz and the HH3 didn't use the 5 Ghz band then it would appear that the TP Link would be the better value for money option
The TP Link TD-W9980 has 5Ghz, the 9970 doesn't. I shouldn't worry too much about wireless speed unless you need it for traffic within your LAN, your internet connection will be the slowest link in the chain.