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There's another tradeoff for lascannons as well. Usually lascannons will cost more points, so the real point of contention is whether or not the increase in damage against tanks is worth the points. I'd argue that this has to be evaluated on a case-by-case basis for each unit and maybe even codex. If you're talking Blood Angels, it's 190 v 130 for lascannon Devastators vs Missiles. But if you're looking at Guard, it's 105 v 90 for heavy weapon teams.