My vote is for Tora 318. Funny enough, i have used all three of these forks. Not the same model year may be.
Marzocchi MZ race came stock on my Kona Cinder Cone 2005. While its reliable and decent fork, it lacks in adjustability. There is nothing great about this fork.
I have replaced the MZ race with a EXR Pro 2005 in 2006. I really like the performance and weight of the EXR Pro. very reliable and stiff. and allows some good adjustability. This is one of my favorit forks. Only second to my Rock Shox Recon.
I also have a Tora 318 Coil with u-turn. A lovely fork with alot of adjustability. Specially for the price I paid for it. I did not feel a significant difference between the Rrecon and the Tora apart from weight. But, you get all the features like Motion control, Travel Adjustment, lock out etc...
so if you want all the function and dont care about the extra weight - Tora may be the way to go. But, if the weight is a major factor, the EXR Pro should serve you well.