Guys, maybe this is a stupid question but, why the hype with the Avalons 821?

Avalon 821 is about $263 per TH/s with no PSU and without shipping ($2900 per A821, no PSU, no shipping)

I just got 4 S9 including PSU and shipping and paid about $192 per TH/s ($2600 per S9+PSU including shipping)

Is just because we hate antpoo and the Canaan hardware is more reliable or I'm missing something?