What phone should I get, Samsung J7 or Asus Zenphone 2?

I'm looking for a midrange priced phone and right now, I can't decided between those two… A lot of their features are more or less the same so it's really hard to pick one. The Samsung's advantage is that it has expandable memory and the Asus' advantage is that its camera is better. I need both a good camera and a substantial amount of memory space. I'm a power user so I need a phone which won't crash or overheat when overworked. I'm at school for the entire day so I also need a phone with great battery life.
I've never had an Asus product so I don't really know if it's reliable, but my previous phone was a Samsung Galaxy Grand 2 and it always crashed whenever I would multitask, so maybe Samsung isn't that reliable too, or it may just be because it's an older model.
Anyway, I need help deciding which one to get.

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