How much difference is there between a refurbished iPhone 14 Pro/Plus and an iPhone 15 for minimal needs?

have decided to purchase an iPhone ...

as my needs are minimal, always have been, have used android for years, but

my iPad and Mac desktop have me leaning in the direction of "one product" connected ...seamlessly ?

That remains to be seen , , , ,,

the question then, as I view refurbished devices, how much difference is there, from say ;

the I 14 pro or plus..to the I 15 same ?

My Needs, still, are minimal ...

I do not and mostly Will not use it for more than a limited amount of texts as well as calls ....

do Not have an unlimited data plan...

any computer stuff, is done at home on my computer, some on the iPad...

that is not changing, so please consider that...

the most cost-effective way to get everything on the same page is my main issue....

Thanx

[Re-Titled by Moderator]

Original Title: best I phone choice