Apple has made the iPad Air 2020 available in five different colors to enable customers to find something that matches their style, taste, and liking. So, we get the Silver, Space Gray, Rose Gold, Green, and Sky Blue. None of the colors are particularly vibrant as the tints were tuned down so as not to steal the user's attention while still giving a pleasant aesthetic result when held and looked at.
Of course, many will revert to cases, so whatever color you'll pick, it could stay hidden under something else, but from the reselling value's perspective, you may want to make a wise choice here. The color choice won't make any price difference in the Apple store.