Which Mate 10 model would you choose?

Two SIMs, yes, but the extra SD slot is optional (but nice-to-have). I really should've grabbed the Mate 9 at $399 last weekend.

Ah ok. Then that opens up your options if the extra sd card slot is optional.
 
Huawei just announced the Mate 9 will be back at $399 during Black friday. It also comes with a complimentary huawei band 2 fitness tracker as a deal of the day for Amazon. You can still grab the Mate 9 for $399 on its own during that weekend with Amazon, Newegg BestBuy and B&H
 
Huawei just announced the Mate 9 will be back at $399 during Black friday. It also comes with a complimentary huawei band 2 fitness tracker as a deal of the day for Amazon. You can still grab the Mate 9 for $399 on its own during that weekend with Amazon, Newegg BestBuy and B&H

Oh nice! Pretty much expected that. They had to raise the price so it could go back on sale.