Why do you believe they are harder to maintain long term? I believe that the iphones have a much more favorable fingerprint that Androids. The only thing I can see with Androids is the fact that you can have a motherboard server which doesn't need batteries. I think acquiring Iphones used and being able to replace batteries when needed may be more favorable. I also am looking at GenFarmer..Android physical phone farms with ADB and custom scripts are definitely much cheaper and easier to scale than iOS. iOS setups like imousexp are way more expensive and harder to maintain long term
I believe Iphone + sim + OTG. One account per device maybe 2 but that will be a stretch. I worry about the battery and this can bring a bit of hazard. I wonder if anyone striped the iphone.iOS devices seem to get more trust overal, they’re more difficult to operate though since there’s lesser customization options.
You can do more than 2 per device, in the end what matter is IP management across those accounts. If each account runs isolated you won’t have an issue, and if you’re automating each needs a unique fingerprint.One account per device maybe 2