Compact-ish and quality Android phone advice needed

Hello folks,
I am searching for a compact and nice smartphone to buy. Nowadays 'compact' term is described as the display size, but now even some 5.1inch phones are quite compact due to their higher screen to frame ratios.
All in all, Im looking for a smartphone
- that can easily fit in my hand and can be used with one hand.
- has a good display resolution and quality,
- has long battery life and strong structure
- and maybe preferably microSD supported.

Now, I went and looked at some phones, even Samsung Galaxy S6 was quite compact in my opinion.

Currently my choices are:
- Samsung Galaxy A3 2017
- Samsung Galaxy S6
- Sony Xperia Z5 Compact
- Sony Xperia X Compact
- Xiaomi Mi 5

Price range: max 450 euros

Which one would you buy and why? I would really appreciate a nice comparison and new suggestions. Thanks.