I would definitely go for a 13 or 15 for non-pro, and 14 Pro and above for Pro

If you want to stick to an iPhone. I would say get the iPhone 15. I got mine a few weeks ago and have experienced absolutely 0 hiccups. It’s a fantastic device. If you have budget constraints then grab the iPhone 13. It’s an amazing phone which is about 85% of the 15, and will be supported for at least 4 years. It’s also regularly found on sale and you should be able to find good second hand deals depending on where you live. IF you are looking for the smaller form factor then the SE is always there!