Yeah it's strange because PWAs were Apple's original plan for iOS apps :)They didn't yet exist under the PWA name but this was definitely what they were aiming at.
But Safari will never be a serious option for me. I want the same browser on all my systems and I use a lot more than Mac and iOS. So Firefox it is.
I still remember the early days of iOS and webOS via Palm and HP, and now LG. We had HTML/CSS/JS powered mobile apps available on the Palm Pre in 2009, and it was pretty great.
But Safari will never be a serious option for me. I want the same browser on all my systems and I use a lot more than Mac and iOS. So Firefox it is.