Avalon 721 is 160 W/TH
Antminer S9 is 98 W/TH
Those figures really only have meaning to you if running miner at home or a colocation center. When buying hosted mining take a close look at fees/TH
- Genesis Mining $0.35/TH
- BW.com $0.26/TH
- Hashnest S9 $0.21/TH
- POW88 A7 $0.18/TH
- HaoBTC 150W HashEx $0.17/TH
- ViaBTC $0.16/TH
ViaBTC has the lowest fees and highest daily payout but there is a problem. Once you buy hash you cannot sell it. All other providers except Genesis Mining have an internal exchange where you can sell your TH when you want. If you do not want to be locked in to your investment choose POW88 or HaoBTC 150W HashEx. Due to outrageous fees stay far away from Genesis Mining.
And also there is another problem. HaoBTC is just mining service, users can not gain the miner at last. Pow8.com give the users right to choose redeem their miners. More likely a miner hosting service ,and provide the hash exchanges for users to sell and buy.