Really that's a loaded question your asking, for a couple of reasons which I'll expound on and try to explain which (IMO anyways) is the better razorback variant. So, here we go.
First up is the shiny new assaultback that offers a few interesting "perks" that most people won't notice at first glance. Premier amongst them is the fact that you have a weapon that on the surface looks great, but upon looking deeper isn't as nice as it looks. There's math that backs up the fact that the assault cannon penetrates AV 14 better than the lascannon, fine and dandy but if you're shooting lascannons (or assault cannons) at AV 14 your in one of three scenarios; 1. the last couple of turns 2. you're desperate to destroy the land raider (whether to prevent the terminators inside from getting to you, or to take it off an objective) or 3. you have very few targets left (which usually ends up being the same as scenario 1), at any other time the lascannon should be used for sniping transports in the AV 10-12 range which is where it shines. The major drawback is that it's a one gun and done tin can, which means one weapon destroyed result takes your razorback out of the game. Now destroying the gun doesn't necessarily mean it's dangerous, far from it, you now have a suicide tank shock platform to push your opponent's troops off an objective in the late turns. The one upside to the assault cannon is not the rending, but the fact that you do have 4 shots to do whatever you need.
Next up is the old school Las/plas, or Stronos, razorback. First things first, I'd like to dispell a few mistaken notions about the Lasplas. The biggest is that you need to sit still to make it effective, which is out and out wrong. By moving six inches and firing one weapon you don't hamstring your vehicle, rather your doing what you're meant to do, using the proper tool for the job. The only time one of these razorbacks should be sitting still is if its immobilized. Now, why would having two weapon systems be better you ask? Two words, improved survivability. By having 2 weapons you force your opponent to have to inflict an additional level of damage to prevent it from doing its job of transport hunting. That means they need 2 weapon destroyed results before it is useless, and that means it's a damage sponge since if its in cover your opponent has to dedicate quite a few shots to "glance it to death" as that may be. This all leads me into my final point about the old school razorback, and that is against a horde army the old school does loses the advantage over the shiny new razorback, and the reason that is is number of shots even though cover saves make those hits just as survivable as a plasma gun shot. The end result is you may miss out on killing up to 3 whole models per shooting phase (which works out to 18 per game, and that's if each shot kills a model), but against a horde three bodies is laughable as they have more to fill those spots.
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