I had them both pitch me SATA (IBM) and IDE (EMC) system.
I then realized how piss-poor the IDE would run, so I had EMC pitch me the same size in FC drives, but told them I had very little leeway now that I told my boss how much I expected to spend, based on the IDE configuration.
Got an incredible price.
I then told IBM that EMC's FC price was way lower then their SATA price, and much better performing to boot. Which in turn drove that price much lower.
Which I then pointed out to EMC - and so on.
Note: I NEVER told the other a real price - that would be breaking the agreement with the vendor. I simply said the other more more attractive.