I have a Chamonix 4x5 and a couple Linhofs (IV and Master).
Over the years with my Chamonix and thousands of sheets/rolls of film, I have had shots ruined by, in no particular order: focus drift, either from heavy lenses or the force of inserting a film holder as there is no focus lock, imprecise neutral positions of the movements causing a slight left/right tilt making edges go out of focus, especially with ultrawides, imprecise focusing from bad fresnel (this was corrected in later versions and I removed my fresnel), accidental forward tilt at "zero" position due to one or more of the front standard mounting holes being tilted (this may be my fault after hauling this cameras for hundreds of miles and regularly knocking it about in use), etc.
Lately I've been shooting with my Master Technika 4x5 and enjoying not having to triple-check movements being zeroed-out, and I also like the focus lock and click-stops for tilt, though I certainly have quibbles, such as the massive amount of tilt needed to get over that click-stop and the difficulty in using wideangle lenses. Sure, the Technika is a whopping 3.5 pounds heavier. I could carry two Chamonixs at that point. But for hikes of only 3-5 miles and not up a mountain it's not that bad. About as bad as my 8x10. As long as I don't overstuff my pack with 4 Grafmatics / 24 sheets of film (I really don't need that many usually) or all the extra stuff I tend to want to bring it's fine. I probably should in time buy another Chamonix, having about slap worn this one out, but if you want more overall precision along with the good packability of a clamshell design, the Linhof is certainly a great option.
Personally I don't like monorails for general usage, so I've ignored those options. Still use my Toyo GII 4x5 on occasion for architecture but of course that thing is double even the Linhof's weight!!
Just some opinions from someone who actually regularly hikes with my LF cameras and shoots a lot of film.
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