I know this is month too late, but I find this type of stuff interesting.

I made a spreadsheet that shows all the weapons that were used in the Championship at E3, and the how often each was used. (including a break down of each mode, and each component of each weapon set)

https://drive.google.com/file/d/1jX4qM9mD9rZGgX2RsbyUFvXEbrsuo7pf/view?usp=sharing

I am a ware that this does not represent the meta-game accurately(is very small sample of games with a vary small sample of players), but I still find it interesting to see what the top players around the world are using in each mode.

What surprised me the most was how much the Slosher Deco was used. I have been saying the Sloshers with Sprinklers are broken for a long time, but most people say that the standard Slosher is better, guess the best players agree with me.

Note: These stats do not include the Turf War matches played at the World Championship