Pumps are like trucks. It's kinda like asking "Who used ford f150s and who used Chevy 1500s?" It's true that some oil companies would favor a manufacturer or a specific model, for example Sinclair loved Bennetts, but for the most part stations could use almost anything. Same holds true today. Shell favors Gilbarco, but they don't mandate them. Modern pumps cost more than most of the cars they fill, so distributors use whatever they can get a good deal on. It's a serious battle between Wayne and Gilbarco these days. (I'm on team Gilbarco

)