Honestly, device I enjoyed holding the most is the original iPhone SE I had for a couple of months. I know, silly. But I miss the “everything-reachable-with-my-thumb” - and I have above average hand size. Had it been an Android phone with better battery life, I’d use it for longer.
The biggest daily driver for me so far was 5,9″. And since there are no more “small” phones that interest me, I just give up. For me, the difference between 6,3″ and 6,7″ is not big enough to grab the smaller one just because it is more compact.