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I have the Revolution, Octanes and a Ti-RantM. Of the ones you mention I would go with the Obsidian. it will work on all your pistols, it's modular, and the baffles are stainless so you can use almost any cleaning method. The Ghost uses some aluminum baffles so no dip or sonic cleaning. The Reolution requires locktite and does not convert from long to short as easily and the Octane has less features at a similar price point. Which ever you choose make sure it's in stock.
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I'm not sure what how a mount-side module is harder to convert compared to an end module design, since both require removal of the module, then you either either swap over the mount or end cap. GreenO has said that the Loctite is insurance against irt coming loose, but they apparently have had one in the shop that has been abused without application of Loctite, so it can work w/o it, but granted, it is in the user policy.
Something to think about if your HG has LH muzzle threads: when I tried snugging my Revolution onto my HK by gripping the tube, & it would always loosen from the RH tube-side threads of the mount. However, the Revolution's thread mount sits outside the tube just enough that I can get a grip on it to tighten it onto the bbl. The Obsidian thread mount tucks inside the can, so you can only grip the tube, which the mount threads into RH direction. Clemsonfan posted a video that showed him tightening the thread module on the Obsidian with a specialized tool they use in their production assembly, & that would probably work to tighten it on the can enough that it would remain secure when gripping the tube & tightening it onto a LH threaded bbl., but they don't sell that item. I appreciate that the Ghost mount extends out enough so that it can be gripped to tighten it down on LH threaded bbls. It's an issue that seems (to me) to get overlooked.
I've researched cleaning Al in a sonic tub v. tumbler, & the information is mixed as to the using the former method, with some saying that short duration periods are okay, while the latter approach can cause the sharp edges to get worn down, though I suppose walnut medium could possibly that. The high frequency sonic cleaners used in auto engine cleaning apps would be ideal, but those are commercial grade items & expensive.