| | Re: need some advise to buy a new one
I have used both. I prefer the screen real estate that the Z provides over the physical keyboard of the Q.
I do type a lot through my day. I guess I got used to the larger screen of my previous device, SGS3. I do love the way the Q looks, but I had to go with the Z in the end. Performance wise, I wouldn't expect that much of a difference. They both run OS 10.x.x.xxx and the difference is the keyboard and screen size.
What works for you?
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