Since my only camera this year was my phone, I have a few photos that look good on phone and Instagram, but not on computer screen, including a picture of the NEOWISE comet.
I guess this is my favourite: I played a lot with my phone's dedicated monochrome camera sensor, and I like playing with perspective, so tops of buildings in black and white are a reoccurring theme in my shots. I have a grainy and moody night photo of an old factory building that I'd pick for my favourite, but it looks shite on computer screen. Therefore, I decided to post this, which is a day photo of an old church taken from pretty much the same angle as that photo:
Sorry that it's vertical, it was taken for Instagram.
A runner-up would be another vertical photo for Instagram, but this time in colour. If it weren't slightly tilted, it'd be my top pick, and since I don't have any photo manipulation program installed on my new SSD, have the original: