Sizing for 1x is super easy. Anything between long enough for the largest, and short enough so the Rd can take up all the slack on the smallest is fine.
Within that range, some people (including me) prefer going as long as possible, so there's room for a larger cassette if it's ever wanted. Other bias to the short end to save weight.
There may (MAY) be slight performance differences based on chain length, with better shifting happening if the RD cage is near vertical on the 3rd or 4th sprocket in, but it's a subtle difference.
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