The Donate Save America slate currently has 5 wins out of 20 and 3 still undecided (I was tallying out of interest here).

Obviously success rates will vary depending on whether slates were picking long shots, so high success rate doesn't necessarily mean a slate was "better" (you could get a higher "win" percentage by picking a slate of people who were likely to win anyway and didn't need the extra money, versus races where the money might make a real difference).

The Great Slate seems to have had a lot of losses, but pushed a lot of races incredibly close to the wire in what should have been "safe" Republican seats.

But it's interesting to look at!