Upgrading from iPhone 8 Plus, and I want to confirm the differences between 15 Plus and 14 Pro Max.

I'm upgrading from an iPhone 8 Plus, and was initially considering a refurbished iPhone 15 Plus. My goal is to get a great battery, a ton of storage, and delay needing to upgrade again in the future for as long as possible.

However, after comparing it with the iPhone 14 Pro Max, the two seem virtually identical. The only real differences seem to be:

- Aluminum frame (15P) versus stainless steel frame (14PM): Is one better than the other? I'm planning to get a Pelican-brand case, which is what has kept my iPhone 8 Plus intact for years.

- 26 hours of video playback (15P) versus 29 hours (14PM), yet 14PM has 95 hours of audio playback versus 15P's 100 hours. Still, that presumably means a better battery in all aspects on the 14PM?

- USB-C port (15P) versus Lightning (14PM)

- 14PM has identical display specs to 15P, but also has "ProMotion technology with adaptive refresh rates up to 120Hz" and "Always-On Display"

Beyond that, every single comparison I'm seeing on the Apple website seems to say the 14PM is "the same as 15P, or better/more". And I'm seeing refurbished 14PM going for cheaper than refurb'd 15P. Would there be ANY reason to consider still going for the 15P instead of the 14PM?

For reference, I primarily use my phone for YouTube, Twitch, a couple social media sites, Pokemon GO, a handful of other games, various helpful applications (e.g. maps, fast food apps, shopping apps), and some light music streaming (which I could circumvent by just downloading it). I'd be interested in exploring other options/features with the expanded storage & performance improvements, though.