Aesthetically, the 118 appears much smaller than the 105. I can't imagine anyone getting upset over it for being over 4 inches, if this is an issue. It appears not much more than a steak or small fillet knife, if you have laws to consider. Sometimes common sense prevails and a 118 personal appears much less threatening than a Vangaurd or 105 or even skinner. It's edge to spine is fairly narrow. For all intents and purposes, they probably perform the same. The 118 has a much larger sweep, if that is important, while the 105 has a longer straight edge portion.
The almost extinct 118 was a favorite of Hoyt Buck, I think, where the 105 was a favorite of the American public, as it is still produced.
I'd say you can't go wrong with either, but over the long run, I'd choose stag over bone and D2 over 420HC, in your particular case, all things considered.
I have a 118 and my son has a 105. Both are sweet cutting tools.