To me it's boxshu. There is no real way to "cheese" your way through competitive boxshu match because it doesn't offer advantages, such as good opener in judo or lifting in abd does. Anything can be easily countered and turned against the opponent. It also involves a lot of predicting, which imo increases the competitiveness even more.

Overall it has a good balance of offensive and defensive elements and it makes for a good mod to duel as it is all about the decisions you make, not about what opener you use.