Well this is a tough one. I've always wanted a new addition to all star WEEKEND (why is it ever on a weekday?) Speed obstacles/races
I'd have Reyes, Ellsbury, Gardner, Crawford all race
Personally, I see Brett Gardner more often and he is very very fast hence the quote from Nick Swisher: "He is the fastest white guy I have ever seen." Gardner has 18 stolen bases and 4 caught steals. Ellsbury has 40 sb's and 7 cs's. Ellsbury has many more games played, however.
The thing I find interesting is that the Redsox play Ellsbury every day at any cost, while the Yankees were quick to demote Gardner from an every day role to a platoon with Melky Cabrera.
I do think, however that if you give Brett Gardner more starts and if he played more often he could have 30 sb's by now.
Jacoby did steal home on a very alert pitcher in Andy Pettite. Plus he does have an advantage statistically.
So lets recap. Ellsbury wins statistically.
I still think that in my personal opinion Gardner is faster. He can run down nearly any fly ball.
I can agree with an argument for Ellsbury though, as I am biased.