Hey Katie!
I’ve used multiple devices for Zwift from a gaming PC, to an iPad, and now mostly an AppleTV4k.
Had you considered a Tacx Tablet mount for your handlebars? You can even add a tray to it for your phone, with only a bit of work. I outline that here: https://forums.zwift.com/t/phone-tray-add-on-for-tacx-tablet-bracket/
It’s certainly the most compact setup. You could also put the iPad on a music stand, tablet tripod, or trainer desk in front of the bike.
If you go with an iPad Air or iPad Pro, they’ll have a USB-C port you can connect to a power-delivery USB-C hub. I use that to keep it powered while riding, and you could output to a TV via HDMI.
I appreciated the convenience of the iPad versus a PC but graphics aren’t as high-res as on a PC. I take an even bigger hit in the graphics department with the AppleTV but I maintain that Zwift is “experiential” so ATV works for me. (connected to an OLED TV on the wall in front of me it’s immersive)