If pro golfers were not paid to put a brand of clubs in their bag, what do you think they

The top golfers game what they want. They can pick brands with whom to sign deals. They can also modify clubs at their discretion. The top clubs don't have much of a difference in terms of performance, so really it's all what fits their eye.

Mizuno if the PGA and Web.com guys did not get paid....Mizuno irons would fill the bags.

Probably:

Driver - Taylor Made / Titleist

3 wood - all over the board - some pros still use the old TM tour eagle 3 wood

irons - Mizuno

wedges - anything forged that meets the eye test

putter - spider, cameron

Mizuno doesn't have the bank roll to fund multiple touring pros, hence why they don't have a "huge" name. Clearly they make superior irons to other brands if 5/6/7 players are gaming the irons and not being paid to do so... ie Brooks

I'd bet that more players would bag Wilson Staff irons if they didn't have to worry about sponsors.

The Wilson Staff FG Tour 100 is golf porn:


and the Wilson Staff V6 irons are getting rave reviews this year: