I have only engaged Q-Windows, it's expensive but since you said it was the same price, maybe it's worth it. The build quality is good. I can't comment further as I have yet to stay in my house but noise cancellation is superb (double glazed).

Optima, on the other hand, I wanted to buy theirs too but after a few engagements over WhatsApp (I stay far away from their office), the guy in charge didn't get back to me regarding the quote. So I chose some other company.

Seems like everyone got the same treatment from Optima Windows. I thought it was because I'm from a far away state that it was not worth it to pursue my request.