I prefer Antminer s7 on Avalon 6.
The new Antminer S7 Plus is much more efficient.
There's not a S7+ version, am i misunderstanding?
And now the latest batches of S7's have the same efficiency as the Avalon6, so not the only reason to stick with S7 is the GH/$, since the Avalon6 has a much better build quality.
The avalon 6 comes at 3.5th/s (thats hoping you have a warm room since they run lower in the cold) and the S7 is 4.8th/s. You can get the S7 plus shipping below $1100 currently. You can ONLY get the Avalon for $1112 in the current group buy and living in the US.
The better deal is the S7. People assumed the Avalon 6 would be able to flex by changing the volts but has not been the case at all.