iPhone, Zwift and monitor

Hey, I’m wanting to use my iPhone 12 with an AV adapter to hook up to a monitor for using Zwift. My question is, does the iPhone only output in full HD (1920x1080) or if I bought a WQHD (2560x1440) monitor would it upscale and give a better quality picture? Basically, am I better sticking with a full HD monitor or would a more expensive WQHD monitor give me better results?
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You probably won't notice the difference when squinting through sweat.
I am not sure. You have no chance.