I do have a Blackberry Z10 and Jolla. I use Jolla as my primary phone because it seems to be more comfortable to use.

Overall, most of what I need can be done without any Android app on Jolla. There are still a few things I have to depend on an Android app.

Navigation: I use Waze. It seems to work better on Jolla than the native app on Z10. It works great on Jolla. No issues.

Banking app. I use couple Bank apps and they works fine on Jolla.

Games. My kids constantly play many Android games on my Jolla. Minecraft, Candy Crush, Farmsville, Little Pony, etc. They all work great on Jolla. Many of these are available native on Z10. Jolla doesn't really have any nice native games.

Browser. I installed Firefox. It worked fine, but it is way more enjoyable to use native browsers than Android browsers, so I removed them. I think Chrome had an issue browsing. It opens, but browsing never works. I uninstalled them so I don't know if it was just an issue on my phone. I could be wrong about this.

Whatsapp. Unfortunately, my friends love it, so I have to use it too. It works fine on Jolla. Z10 has native app.

It is much easier to get Android stores going on Jolla than Z10. It takes some work to get snap on Z10. You can install Google Play Store (if you want) pretty easily. With that installed, automatic updates works fine for Android apps.

Side loading on Jolla os way easier than Z10 also. Just open the apk with the filemanager and hit install.

Overall, with my experience, Jolla implementation seems to be better.

I wish there were native apps for Whatsapp and Waze. Then I could leave Android shutdown (I don't think you can do this on z10) most of the day and start only when kids want to play games.