Generally speaking D3 will be better in most ways due to likely quicker ROI even with more X11 ASICs flooding the market and more possible profit as well. It's really up to you in the end though, just watch out and don't buy from people selling accounts. They can go to Bitmain saying they lost their account or got hacked after the sale and you'll be fucked.
Bro I have heard that antminer
S9 is the best miner in the market to mine btc or alts. Got information States need to have a hash rate as big number to be mining and earn profit pretty decent. Which is the cheapest one among these miners?
The S9 mines BTC only, the D3 only mines an altcoin....
Never shall the twain meet.