Optoma vs BenQ
I think the BenQ is better quality because I've had it too.
The optoma frame is great compared to the BenQ... But when it comes to stretching the canvas..... The BenQ is better. (more spring) with the optoma I had to start again several times. As for the black edge, the BenQ is even better in design.
As for wall mounting.... The optoma is excellent and it has adjustment screws to fine-tune the installation...as long as you say that the BenQ doesn't have the right to make a mistake of a few mm.
When it comes to projection, the 2 screens are of good quality, but I still prefer the BenQ.
The screens are very good but a mix of the two screens would have made the perfect screen.