Most wear resistant composite is:
Hybrid composite resin materials have a combination of small and large filler particles, to combine high filler loading with a sufficient quantity of small particles to ensure improved wear resistance and also permit adequate polishability. These materials are quite strong, polishable, and have wear resistance equivalent to amalgam.
Sturdevant Operative Dentistry 7th edition page 471
Traditional composite
Macrofilled composite
Hybrid composite
Packable composite