l hate scope screens because my usage is mostly not movies. I watch a ton of TV shows and play a lot of games in my theater. However, in your case, I'd definitely go with the scope because it's far bigger and the differences in 16:9 content is small. For me, I already have the widest screen in my room possible so 16x9 makes sense. I also have an electronic masking system that's automatic based on movie aspect ratio at playback. You could make your masking system be electronic using an electric drape type install.
Video: JVC RS4500 135" screen in pure black room no light, htpc nvidia 1080ti.
Audio: Anthem mrx720 running 7.1.4, McIntosh MC-303, MC-152, B&W 802d3 LR, B&W HTM1D3 center, B&W 805d3 surround, B&W 702S2 rear, B&W 706s2 x 4 shelf mounted for atmos, 2 sub arrays both infinite baffle: 4x15 fi audio running on behringer ep4000 + 4x12 fi audio running on 2nd ep4000.