stylistically which is most correct, cards or the letter d?

main.go

// create a 'reciever' function
// this construct establishes methods on the variables we create
//-----------------------------------------------------------------------------
// 'cards' is a reference to the main.go/main variable: (presently instantiated) cards
func (cards deck) print() {
	for index, card := range cards {
		fmt.Println(index, card)
	}
}

//-------------- same thing with a d
func (d deck) print() {
	for index, card := range d {
		fmt.Println(index, card)
	}
}