That plastic glue is rough stuff on your models. I've never been a fan of it over plain old super glue as I've never wanted to put the effort into dealing with the application and cleanup. Plus, if you have second thoughts about your weapon options it's easier to just pop off a super glued arm (even if it was pinned in place) than it is to cut off a plastic glued arm.
I do sort of see what you mean, but I like working with the plastic glue, and I can cut things off if needed (plus, handy to know my models won't fall apart when stripping them or something similar).
I play PCs in my squads and use a CML in my command squad (that's armed with 4x TH/SSs, a CML, and one's an apothecary). I used to use the missile launchers everywhere but those points add up pretty quick even now that our squads are generally a bit cheaper. I also played two AC squads for a while because I had some Dark Vengeance guys but invariably phased them out of play. They now have Heavy Flamers on them for when I play my old version of Space Hulk.
Gotcha I suppose, so if narrowed to the two I want, you'd say the CML?
Do see what you mean about the points though, concerned about picking it over the AC for that reason.
Will also say I wonder about your Command Squad, I thought it wasn't legal to put a CML on a Hammernator or an Apothecary?
What have you heard that has you so spooked about the plasma cannon? Gets Hot is barely a worry unless you're rolling consecutive 1's (which bones anyone), and scatter can be frustrating for the user at times but that blast template can touch multiple vehicles or potentially a whole unit that just disembarked a wrecked transport. Both of these things happened to me in my last game, let alone when I'm using the weapons against my opponents who might not have the same experiences I do and can leave themselves vulnerable to such things.
Gets Hot is really only the tip of the iceberg, most I've heard discuss Imperial Heavy Weapons seem to hate the Plasma Cannon for the unreliability of Small Blasts mostly (I did hear someone else say that's not a big deal, in the context of the CML's Frag Missiles against hordes, which resonated since I know I'll be facing Nids and Guard), though looking at it, Heavy 1 and its statline seem kinda weak. Seems like it'd only be better against massed MEQs and TEQs, with the other two better against horde infantry and vehicles.