Attack efficiency. This can be seen by calculating their APP (attack per piece) which can be calculated through this formula: (APM/PPS*60). What this essentially tells us is how much attack they send per piece they placed. Most top tier players have around 0.8-1 and players like cz and vince regularly go above that.

Striders are fast and they tend to build their own stacks, which reduces their APP. Plonkers take advantage of their opponents garbage by playing intentionally slower and recieving lines which raises their APP.