If there's no desire to try something new, no amount of text or listing advantages will entice the player.
I'll say that for a long time, I didn't want to try Heroes of Might and Magic VII, because I had it in my head that it was like Heroes of Might and Magic V, which I couldn't stand. But I tried it once, twice, and got hooked. And the tournament should definitely be held on the version that most participants play.
In general, if there was a desire, dear Heroes players, a desire...