I don’t have any data, but besides Saliba’s goal vs Burnley I can’t remember when was the last time we scored from set piece. Many times Saka and Martinelli corners are cleared on the first post which is frustrating.
I have heard on some local tv praise for Arsenal’s set pieces and now read Kompany saying something similar about them being the best at it.
Based purely on eye test, I find West Ham way more dangerous. Ward-Prowse is perhaps the best set piece specialist and Soucek, Antonio, Zouma etc are real aerial threat.
Which team you find best in set pieces?
I do not think its just about good headers. Arsenal can play various solutions to any set piece which makes it difficult for deffenders. With West Ham you know the ball goes to Souček.
Arsenal switches the style of set pieces two three times a game. Far. Front. Short. Long. Fast ball, high ball, direct. They are also very good at controling the zone afterwards. Getting rebounds and keeping you locked in.
Which I would argue is more difficult to deffend opposed to just keeping big guys at the big guys.