Club championship of the CIS countries.

The difference is that EVERYONE started with SoD and EVERYONE knows how to play it; naturally, in an unfamiliar version, SoD players might not be able to get their bearings right away.

That much is clear, but the point remains the same: if you've already grown used to WT/TE, the hotkeys, and all those conveniences and balance changes, then when switching back to SoD, you might simply overlook or forget something—even a small detail—but even that can affect the outcome