[Q] few q. before upgrade my device topic

Hello folks
I looking for my next dally device for the next 2 years.
Is the any problem with the z2?
Glass is fragil?
The sound is load and well?
GPS work fast,steady?

I thinking between nexus 5/ Sony z2/ HTC m8
Wich from them is better?
My demands are : updates ,battery, from time to time I need to drive with GPS so he should be well.

Thanks!