IPhone 5S debuted Apple's newfangled fingerprint sensor and 64-bit processor three years ago, and it's still a viable smartphone for anyone on a budget. It's held up well enough with a good camera and iOS 10 software update.
A staggeringly fast processor, excellent build quality and a great operating system, what's not to like?
It's also supremely well built and surprisingly light considering that sturdy build quality. The screen may be small but it still competes with the best in terms of quality. There's really no need for any more pixels since at 326ppi, you can't see the individual dots anyway.