I responded a bit late at night and forgot to add my thoughts on the mobile app not selling packs. I access splinterlands on a mobile device, although I should clarify that it is a small tablet, not a phone. I play from two accounts, one via a browser and one via the app, so I merely change to log in via the browser in order to by packs on that account. I also have to do that to claim my SPS. So while it's awkward, it's not impossible to do on a mobile device (I've also discovered I can access a browser via the keychain app). It would, of course, be preferable if it could be done on the mobile app, but then they've always been behind on updating it, which isn't ideal considering the high percentage of people using mobiles for nearly everything now. Someone a while ago said more people access Hive via a mobile device than a desktop.
I go with Fire. I think I need to look at strengthening that splinter, but I'm still figuring out the best approach.