Re: Help me buy a new phone!
Looks like you want a new toy or a phone on a reduced budget.
If it is to be a Daily on a budget, I'd sort of suspect Z10 is a magnitude higher in price than any of the others.
iPhone 4, even used, is still overpriced to my way of thinking...
Z3 might be interesting... And the Android App emulation thing helps if you are after Apps for a daily, but the learning curve might be steep. I believe Windows Phone rightly gets marks for ease of use.
So...
Z3 is newer
720 probably has more support longevity
Z3 may do more in the long run if lots of Apps are important to you
Z3 gets a nod for screen size and resolution
720 wins on camera
720 has a great rep for build quality
One Note: I can't find the H+ speed of the Z3. I suspect (because of the 2014 launch) that it is 42.2 mbps and the 720 is clearly listed at 21.1 mbps.
Hope that helps. More input from you on reasons and criteria would yield better results from folks answering.