By personal experience, Note 4's have battery draining issues. If I were you I'd go with the Note 5 or 6. I miss my Note 4, so when I can I plan on getting the Note 5 or 6. I heard they have better battery life. Hope this helps ya
Hey "Note 6" never existed, they jumped straight from Note 5 to Note 7.
I agree with Note 4 having battery draining issues, I have the international Exynos version Note 4 since mid-2015, still fully working, but I went through 6 batteries already. It's a fantastic fully featured phone with a great camera, but way too slow compared to 2020 flagship or mid-range level.
I recommend ZeroLemon batteries for the Note 4. Also Anker were OK but it seems they aren't available anymore.