I prefer physical manga and books simply because I have an easier time focusing on them and I do fall for the pretty bookshelf trap (though I'm also running out of space like a lot of people here haha).
I still read digitally though and I will usually go for digital for something I'm reading for the first time and want to try out, but I've been doing it less often these days because I'm trying to disconnect my reading time from my screen time. I do have an e-reader, but I only find it good enough for novels. The experience is very inconvenient for me with manga, so if I want to read one of my digital manga purchases, I have to use my phone instead which feels kind of counterproductive.