Board Thread:Game Updates/@comment-30542734-20190714061814/@comment-32647310-20190723200658

Spotting plane is your best option, especially if you can get Air Superiority/Supremacy (AS/AS+) for Artillery Spotting.

Radars are best when you can't have spotting aircraft for some reason (such as you know you can't get any Air Power).

I have heard noise, but I do not know how true it is, that if you don't go through the whole Aerial Combat Phase (this happens when neither side has aircraft that engage in air combat), there is still a chance for Artillery Spotting benefits to apply. I am not aware of how true this is.

This all being said, if you are forced to choose between a spotter or radar, go with the spotter.