True but the spread in Coz dive ops does not necessarily entail a change in level of service or quality.
But, there are differences. I'm thinking about spending extra to go with Living Underwater on my next trip to get the 120 tanks with no restrictions on dive time (other than the computer). I can't pay extra for 120's at 3P. I could get it with Dave, but I might be upsetting other divers for being the first one that needs to go up (air hog). Also, the SI snacks can be a bonus. Worth an extra $100? No, but it does take some of the edge off the extra cost. Now, I would be fairly annoyed if I paid extra and got saltines for a SI snack.
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