My sister had iPhone 5C JV and it worked fine. She was using Ufone 3G with it and it worked perfectly fine. Price tag is around 22-25k.
My other sister still has her S4 Active. It's basically a waterproof I9505 S4. Great phone with better build quality than the normal S4. Performance is quite good (both with 5.0.1 and 4.4.2).
Price tag is somewhat the same for both devices.
Its your personal preference as to which OS you want.
Sent from my SM-G900F