I have not played an Eh?, Moxon, or Irving. All of which use the same axle as the Sullivan. The Moxon was appealing to me because it is narrower than the Sullivan and looks like it was made as an improvement to the quite chunky Sullivan.
I would have bought the Moxon if it was in stock in Bubinga. 
The Eh? looks interesting. I want to see more specs on it.
Performance wise I think it really comes down to personal preference I don’t think any shape will really drastically alter performance since with either you will have 10-15 seconds to do the tricks. 