Well: I won’t spend 200+€ for an i7 because of my concerns about homogeneous quality in this Intel cpu. I won’t because I don’t like 100°C pikes in temp. and subsequent fan ramps (call me ignorant, but I’ve researched & I’m the buyer).
Intel’s i5 seems to me like a more robust chip, with lower & more constant temp.
I accept that maybe I’ve become a little superstitious, as my 2010 i7 lies in my desk, broken because intense heat & quick temp changes. Just read about what happens with microsolderings & how to “reflow” a gpu. Yes, I know last iMacs gpus get even hotter... I just don’t want to add 20°C more to the only fan, in favor of a better performance that I don’t need.
Assuming now that I’ll have to change my system every 7 years (and be happy about that!), I’m seriously considering to spend just enough to accomplish my work. Future-proof is a slippery concept in technology...
Also, i7 is an upgrade option. One could think (like in cars) that i5 is the most proven model... & changing the motor but keeping other parts the same spoils reliability.
(Anyhow, I keep reading, as I’m still dubious about what iMac 5k is the best for me)