Bluetooth Wireless Keyboard or RF wireless keyboard- which is better

HI,

I am thinking to use wireless keyboard with my pc, I have bluetooth in it so I am now I am confused which one to buy, because if I buy normal RF keyboard then I will have one USB port always occupied for its nano-receiver and if I go for bluetooth then there will no problem as I hardly use bluetooth of my PC.

But I am not sure which one will be reliable and easy to use. I don't want to resysnc device often and I want ease of use.