For what it's worth, my 8+ fits into any pocket I have/wear, just as my 6 did. No issues at all. Handbags might be a little different, like if they have built in "cell phone pockets" or something, but that's not a deal breaker for me. Those smaller pockets are perfect for keys and chapstick, and there are always (well almost always, lol) other areas in the handbag for my phone.
As far as one handed use -- my little sausage fingers are loving the new one handed keyboard! Can be set for either left or right handed use. It's perfect. I use a Loopy case, and with that, I can reach all corners of my screen.
Netflix and I share a close bond.

I love watching on my 8+! Also, reading on the phone is nice too. It's not so small that you feel like you're turning a page every 6 words, you know?
Good luck with whatever you decide!