I'd suggest
LG G3
Galaxy Note 3
OnePlus One
My boyfriend has the LG G3, I have the OnePlus One, and 3 good friends of mine have the Galaxy Note 3.
My aunt has an iphone 6, it's not great, but I guess it's at least a little better than the other iphones aside from a less durable form factor (as far as I've heard).
As for the former 3, I'd suggest the OPO over all of them in terms of performance / specs (and price; if you're looking for an unlocked device, this is the cheapest by far of any of these phones). My personal second choice to that was the Note 3 because I like styluses, but I do believe that the resolution of the LG G3 appeals to more people.