[KLJ]

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1) RF vs IR
2) type of screen
3) batteries or no batteries

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I can't really imagine what you mean by no batteries. With regard to RF vs IR, you want RF if possible because IR needs to have clear line of sight to the device. With RF you can point the remote sideways and the device can be inside a wood cabinet and it will still work. (I don't actually have RF, but this is my understanding.)

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i dont have any components hidden in anything so i dont need RF. some remotes have internal batteries (like cell phones) and recharge using a dock, some use normal batteries