Having raced all 3 platforms I can confirm that the Slash is the clear winner because it will offer the most stability and will be the least likely to require marshaling when you wreck. Open wheel designs are difficult to race for Sportsmen because they tend to get tangled up with each other where you can get away with more "rubbing" with a Slash.
I have some tips here back when I used to race the Spec Slash class:
https://www.rcgroups.com/forums/showthread.php?2586859-Spec-Slash-Racing-Tips-and-Setup-Guide
Keep in mind that the Slash requires A LOT of maintenance if you want to be competitive with it. I pretty much had to rebuild the diff every single race day because the diffs are not sealed and the diff fluid will leak out
Just that reason alone would have me recommending the Losi 22S which also offers far more modern geometry and tuning options not available with the Slash... basically Slash would be taking a knife to a gunfight against the 22S:
https://www.horizonhobby.com/product/1-10-22s-2wd-sct-brushed-rtr/LOS03022.html
Slash also has far too many design flaws requiring a small fortune in upgrades where the 22S doesn't require a single upgrade for durability.
I am not affiliated with Horizon or Losi, in fact I am a team driver for HB Racing, I am just giving honest feedback on my personal experiences with this race class.
Good Luck!