Regardless of what that contest will be in the future, it will be still be good for the promotion of the project as there are a lot of gamblers who like those kind of competitions. For me I would rather join price prediction, I joined multiple times however, I'm not that lucky.
But for the slot multiplier contest, you can just be at awe on those members that join and hitting those big X multiplier and you can only wise that you can also be as lucky as those individuals.

High likely it will be slot multiplier contest but perhaps there will be also prediction contest because these 2 contests are the most popular contest in this forum.
You are right that if it will be slot multiplier contest, we have some members in this community who are dominating such contest with huge multiplier but it does not mean that the chance for new comers is small.
Every participants has equal chance because it is about luck of hitting nice multiplier in slot games, those who are willing to try more will be getting bigger chance but the risk of losing more will be also bigger.