I have a similar situation to yours except in reverse. I have an iPhone and an Android tablet.
What I like about this arrangement is that I get the benefits of each OS and the various apps.
There are many apps which are available for both Android and IOS but there are also a significant number which are not.
So by having the two different devices I basically have the best of both worlds.
Most dissatisfaction I’ve had has been related to the device itself rather than each OS.
Even tho the ipad will now be available in a smaller size (which I prefer) I’m not really planning to get one. I’ve found that I really like being able to use both OSs and you may find the same is true for you.
One thing to keep in mind is that most major app developers of very popular apps are doing IOS apps first and eventually Android as well quite a bit later.
If you can afford an ipad, I’d say go for it. if you discover a year later or so that you don’t like it for whatever reason, they hold their value really well and are highly desired so you wouldn’t have any problem ar all in selling it.
I don’t think the same is true of most Android tablets. There are a few reasons I’m not getting an ipad and cost is one. The other, of course, is that for me it would be a needless duplication since I already have an iPhone that I’m quite happy with.
But if I had an Android phone, I would definitely get an ipad rather than an Android tablet.