Splitting weapons in the squad or not has way more to do with what's in the rest of your list than it does taking advantage of split fire or messing with the opponents target priority. You're taking the HW to fill a tactical role in your build, and that should always be the first priority. If the rest of your list has good TAC fire power then sure, mix it up, but if what you need is anti-tank, then take all LCs and go home happy. The ML are generally suboptimal in any build, but they do look cool.
Personally, I think LCs, PCs, and HBs are the weapons to seriously consider based on what your build needs. I find that LC are usually the niche that needs filling in a lot of marine lists, with the exception of bulk plasma lists. It all depends on the build though (said Captain Obvious).
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