Reasonably powerful – we live on a very steep hill
This plus wanting to go shopping probably tips it to needing a mid motor to me. We’ve a radwagon (very heavy hub motored cargo bike) and it’s zippy up to a certain gradient after which it really bogs down (it does still help a lot- I can get up our local two chevron on it in normal clothes without turning into a sweaty mess, but it really doesn’t feel like it while you’re doing it).
Something toward the mountain bike end of hybrid with rack and pannier capability would be what i’d be looking at.
I’d say these are likely to be available on the cheaper end of ebikes so it’s less of a commitment. If after a year or two you discover you really want a Tern it’s less sunk costs to switch!