I don't know what phone I'll be picking next, but it will most likely be a "battle" between Samsung or Google. Samsung because I quite like their designs and also the TouchWiz UI got so many improvements over the last years and it is less laggy (probably not because it's been optimized but rather because Samsung phones have been buffed hardware wise), and Google because, as already explained by colours, I'd get OS updates as soon as they're released without having to wait for the Brand/Carrier to get things going and also because I've liked recent Google's designs.
So my requirements for a phone are:
-At least 32 GB of internal memory, which for me are enough even when I have tonnes of apps since I don't store a lot of media.
-Expandable storage, since you never know if you might need some extra space.
-Good camera, I like taking pictures and videos every now and then so it might be handy.
-At least a 5" screen, pretty common nowadays though.
-Good multitasking, and for that I mean for example that apps get resumed right where I left them and not that if I go back to them via the multitasking screen the phone just restarts them, so for this I think that 3 GBs of RAM are required.