The contaminants in the oil are in suspension when it’s hot just after shut down, the contaminants will drain out easier and more completely this way. Many owners manuals for older cars prescribe this method, many didn’t have oil filters so they asked you to follow that procedure.
When cold it all settles and sticks to the bottom of the pan, you get less of the contaminants out this way.
Do whatever you wish.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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