There really isn't a comparison between H6 and HS.
The MG HS was the first MG SUV under SAIC along with the ZS and is still in it's first generation. It's local partner also had it's own set of issues in Pakistan.
The H6 on the other hand is in it's 3rd generation and is one of the most popular vehicles under GWM which itself is the largest SUV manufacturer from China. It's also sold in around 40 countries and so far has been well received everywhere. On top of that, Sazgar has been producing, and exporting vehicles from Pakistan for a while now.
I'm seriously considering it as my next vehicle since the Cross ended up being a disappointment for me personally because it's not much of an upgrade form my C-HR and is actually inferior in a few ways as well. I'm just waiting for a couple of months to see if Cross makes a dent in H6 sales and Sazgar drops prices or introduces the PHEV.