We have quite a few options that can output a very similar amount of shooting damage per point against infantry models. In that list we have Kabalite Warriors, Kabalite Trueborn, Venoms, Hellions, Scourges, Beastmasters and Mandrakes.
Generally vehicles are harder to get rid of than infantry, and the Venom has longer range, so is a superior option to the other choices. Getting objective secured on the Kabalite Warriors and Venom combo also gives them an edge.
Mandrakes are OK, and are the only option that has something the Venom doesn't have - that being Shrouded and Stealth to force the use of ignores cover weapons or assaults to get rid of them.
If you really like the idea of Scourges zipping around with splinter fire, I would suggest squads of Beastmasters instead. Slightly more shots for your points, and don't die moving through cover.