With the level of service these guys get do you really think it matters that much? Say you're a TM guy or a Callaway guy. Both companies make several drivers, iron sets, etc. With launch monitors, access to any shaft out there, pro club builders able to change loft, lie, swing weight, etc do you really think a guy couldn't get set up with one company? Serious question
Says the guy from Carlsbad, CA.
Seriously Callaway has some nice clubs and obviously custom make them for each pro but personally I prefer a TM driver and Vokey wedges. Bottomline the player often in contention and getting the tv coverage on weekends will make out fine in endorsements anyway. Golf is such a mental game if using a Vokey wedge gives them more confidence to even shave off one stroke over the course of a tournament it's worth it on today's PGA. If I were in Reed's position would be using the clubs and ball I feel most comfortable and the tournament winnings/endorsement money will follow.