As Ralph said the Eduard photo-etch set is best in accuracy of both lower and upper catwalks. I have studied the set and mucho patience will be needed in alignment of both walks. Critical planning is needed in sequence of building these Hobby Boss kits. Also Eduard did only one type of catwalks which is common to some of the LHD class but not all. Catwalks differ from ship to ship in mainly layout of platforms.
Neither model correctly does the complex catwalk system of the actual ships. On the actual ship (I have seen Wasp herself in person) the lower catwalks attach to the hull. Then, strong vertical bars (stanchions, as described by GMM) rise from these lower catwalks into the underside of the flight deck overhang. To this row of stanchions the upper catwalks are then attached.
For simplicity of assembly on an overly simplified kit, Revell just mounts both lower and upper catwalks directly to the hull. GMM can't do much to correct this, but the catwalk railings which comprise about half their Wasp PE set are designed both to precisely fit these (incorrect) plastic catwalks, and to visually try to provide the illusion of the stanchions. The rest...anchors, helicopter blades, radars, mast supports, and such...might be useable. But half the set...the catwalk railings...have little use on the Hobby Boss kit.
The Hobby Boss approach to the catwalk issue is closer to correct, but overly simplified so as to leave a rather strange looking arrangement. All catwalks...lower and upper...on the Hobby Boss kit are PE. The lower catwalks fasten (correctly) to the hull. However, for the upper catwalk PE, one is instructed to fold down the stanchions attached, then glue those folded down stanchions to the edges of the lower catwalks. Good...except that is only "half the system." The real stanchions extend from lower catwalks to flight deck overhang. Since the folded down stanchions only fold down from the upper catwalk, there is nothing which continues from the upper catwalk up to the flight deck overhang. Thus, the HB upper catwalks "hang" oddly in the air from (flimsy looking) supports rising from the outboard edge of the lower catwalks beneath. (Hard to visualize, I realize, and really not easy to describe, I assure you!) Almost all the limited PE in the Hobby Boss kit is devoted to these catwalks themselves, so other things like helo blades, anchors, et al from elsewhere would be nice.
If you really wish to torture yourself with PE, and fixing this catwalk mess, Edouard makes sets specifically designed to rectify the Hobby Boss oversimplified portrayal. (The Revell kit is considered "beyond hope"...Edouard's set is not meant for that kit at all.)
I have built the Revell Wasp (without PE.) I have owned the Hobby Boss Wasp at one time. And I have seen the real Wasp.
The upshot/short answer...about half the GMM set looks useful for the Hobby Boss kit.
Has anyone tried to use the GMM Wasp PE set on the Hobby Boss kits? I know they were designed for the Revell Germany kit, just wondering how compatible they are.