Was the ipad you borrowed a full size one, or an ipad mini?
It sounds as though you are definitely after a tablet rather than any phone or hybrid device.
You are currently paying for what you use with your galaxy. Presumably you have a sim attached to some sort of billing method. Is there a reason why you don't want to carry on using that method? If you could get a tablet where you could just swap that sim over, and carry on as you are payments wise, that sounds like the ideal to me.
I have only ever used iPads, in tablet terms. I like them (both full size and mini) but I appreciate you are not looking to be persuaded. Fwiw, the mini is a great size, imo. Big enough to do everything you want, and small enough to be properly portable. I have a wifi only ipad, but use my phone as a wifi hotspot if needed (usually when away from home in a rented cottage or similar, although wifi is becoming standard in holiday lets now). Battery life on an ipad is also good. For standard browsing (as opposed to watching videos, streaming live tv or playing graphics heavy games) it is easy to go a full day (and more) without charging.
I haven't ever used one, but have you looked at a kindle fire tablet? I think they are on offer this week as part of Amazons Black Friday deals. It might be worth considering (I have a standard book-only kindle, and I like it well enough, and amazon customer services have quickly and easily cleared up the few issues I have had over the years I have had it). Size wise it probably does what you want it to.