I have an iphone 12 mini and hope to upgrade to a 15 Pro this year.

What I'm looking forward to:

• Better battery life. The 12 mini's battery isn't that great and the 1st gen 5G chips were quickly improved upon.
• USB C. Means all my chargeable devices would be on a single cable.
• The upgraded camera that was introduced in the 14.
• The A17 SoC in the 15 is expected to be the first major upgrade in a while. The SoC in the 14 was held back by TSMC's N3 being delayed, and the SoC in the 13 was a decent but not great upgrade.

None of those particularly apply to you. I was on android before my 12 mini and what I like most about the change is: the interface is snappier, most apps are built for ios first and android second and generally that means you can rely on having a working version of the app. Also the biggest reason for me to make the switch: Apple supports their phones for 5+ years will full updates, not just security. I think android has seen improvement on that front since I switched, but still isn't at the same level of software support.