The issue with iOS is all browsers have to use Safari backend so it's not the same as on other devices.

I've also been on Vivaldi since right around the start. I'd just wish they would fix their address bar suggestions to actually work. It isn't great to start, and then decides to completely break every few months and do stuff like when I type "you" to go to youtube it insists on autofilling to a specific video I watched months ago. The only fix I've found is to nuke the profile and start over.

I've switched to Zen on my computer a couple months ago exclusively because of that issue.

yeah I use vivaldi on mobile and it's so painfully slow and horrible. I'd switch but I hate using my phone anyways so I don't really care.