Ren'py is just the easiest to use imo. Built-in skip, auto, hide textbox and easy save/load. I'd also like RPGM if they let you easily change keybinds.
I like when a game has more unique music. When it feels more like a choice made to add to the scene, not the same 5 royalty-free songs that a lot of VNs grab.
I think for me this site had a more recent update for a game compared to another site I was using and it wasn't until later that I learned about the selection here