IMHO
- both USB/charging port and headphone ports should be on the bottom
- ensures pocketability when charging on the go with a USB battery pack while listening to music
Good
- iPhone 5S
- HTC One M8
Bad
- Nexus 5
- Samsung Galaxy S5
- Lumia 930
Other Notes
If you’re stuck on with a device with non optimal port placement, I suggest getting right angle connectors for your headphones as it at least allows the device to rest on the connector without straining anything too much (you could also get a right angled USB connector, but it is yet another thing to worry about if you care about USB charging speeds)
The Wheat Field 
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