At the same 16:9 aspect ratio, moving from 100 to 120 inches increases both width and height—not just the diagonal. That affects furniture, speaker placement, the projector's distance from the wall and how much of your field of view the image occupies.
100 inches usually wins on flexibility
It is easier to fit above a cabinet, easier to illuminate brightly with a given projector, and often easier to integrate into apartments or smaller living rooms.
120 inches usually wins on immersion
If the room and seating support it, 120 inches can make the UST system feel more distinct from a large television. But the room has to absorb the extra width without compromising speakers or walkways.
Test the outline before ordering
Use painter's tape to mark the approximate image rectangle on the wall. Sit in your real seats. Check subtitles, sports scoreboards and game HUDs—not just cinematic scenes.
Check the projector geometry again
UST placement changes with image size. Confirm the exact required distance and height for your model before you mount a fixed frame.
Check current PET Crystal Classic sizes
The live merchant page lists available sizes and variants for the featured screen.
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Keep researching
UST screen size guide
Work through the complete sizing process.
Fixed frame vs floor rising
Decide whether the screen should stay visible.
Product pricing
Compare cost after size is settled.