s9 is the best?

After halving day , mining began to decline for pera miners . But the company has released ants9 Bitmain which became one right choice profit mining tools . Is this a pretty effective I have not tried . I'm still confused want to do mining bitcoin or altcoin in order to get results that maksimal.mungkin someone can give me advice .
Maybe if bitcoin prices stabilized at $ 700, the miners still have the advantage .