There is quite a difference in space and size between the Ioniq and the Zoe.
Ioniq is more of a family car, but the rear view is marred a bit by the wing across the rear screen, whereas the Zoe has a better rear view. Ioniq is spacious and it is quite comfortable for many although I never really found a good driving position, with plenty of tech which the Koreans excel at. The rear wing spoils the car for me. Not that enamoured with the looks of the Zoe either, but it’s way better than a Leaf, BMW i3 and some other early EV’s that look just odd. Zoe does have some reasonable tech and as others have said does charge at 22kW AC which can be a real benefit if rapids are unavailable. Best looking small car is the Pug 208 for sure, but the compromise is small steering wheel that gets in the way of the dash instruments.
Nearly all EV’s are not a ground up design using a battery skateboard design. Most are compromised as they have ICE powertrain variants.
So you are probably guessing all these cars have compromises and the best thing I and others can tell you is to write a list (or excel spreadsheet) and itemise the things that are important to your needs. Score each of the at least 5 items out of 10 points for each car and add them up. The car with the most points should be the one you should get.
I guarantee that your heart will overrule the ‘scientific’ result achieved above and you’ll go with the one that you ‘really’ want and that might just be down to looks or practicality.
And as others have commented it’s a 2 horse race