The Choker is more offensive-based than the Infestor, capable of engaging enemies directly. It has a tentacle attack that shoots up to 5 tentacles that drag targets towards it, doing damage over time.
The Choker counters Bunkers and Planetary Fortresses since Chokers out range both and deal additional damage versus structures.
The only semi-effective counters versus Chokers are Barracks units stimmed with Medics to focus fire them or well-placed Siege Tanks.
The Choker's tentacle ability makes it highly dangerous against lone units. The units are first hooked by a tentacle similar to the Neural Parasite which drags them toward the Choker whilst incapacitating and damaging them. The unit is only released if the Choker or its prey are killed.