FWIW whilst I think there are reasons to go Android (budget, gmail-junkie and, err…budget?) app compatibility isn’t one.
Whilst it’s true all the exact same apps will run on the tablet, that’s not a good thing. Most will look crap and make bad use of the space as they’ll not be designed specifically for the tablet.
If you just want to browse the web, watch the odd video and do email though there’s not a lot in it, pick your favourite. Though consider screen aspect ratio, I find I prefer 4:3 portrait to 16:9 portrait for web page reading. There are android tablets with both ratios, tho 16:9 is sadly more common. Better if you’re mostly watching video though.
If you want it for games, iOS no contest.