If you have the option to shoot at 60fps, shoot at 60fps and you can always re sample to 30fps in post. Since storage media is not an issue for 1080p, 60fps is manageable. The advantage of 60fps and slow down to 30fps is so that you can "stabilize" your footage without scarify pixel (which happen when you post process to stabilize a video using rotate+zoom algorithm).
If you have an option to shoot 4K, by all mean shoot 4K, it makes your footage kind of future proof, and 4K gives you the flexibility to zoom and crop, especially for macro subject and output to 1080p. If you are shooting video for artistic reason, 4K is prefer because 3 years from now, people would still watch 4K content. If you shoot at 1080p, your content will become obsolete very soon, just like not many people is interested to watch DVD these days because they are only 740x480.
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