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Hi Rick, I do not have any experience with or knowledge of the specific guns you mention. However I will give you my thoughts on touch-up (sometimes called spot) guns. I have a DeVilbiss SRi spot gun and also an older DeVilbiss EGA spot gun. I have used the SRi to paint the sheet metal on my AC-B. It worked fine, even with only a four ounce cup. As long as you do the pieces individually and can cover one coat without refilling the cup, the spot guns work very nicely. Tractor sheet metal, for the most part, does not include large broad surfaces like a car roof or hood and if the pieces are done individually, does not require a regular sized gun. The main tractor castings are another story however since the total square footage is too great to cover one coat without having to stop and refill the cup. Unless, of course, they are all disassembled and you can do a piece at a time. If everything is assembled except the sheetmetal the only way to successfully use a spot gun on the main tractor is to tape off sections and do only as much at a time that the cup quantity will permit. A real pain but that would work. I know there are larger cups available for the SRi but I don't know about others (I would guess not). Ideally you should have both a regular sized gun and a spot gun. However, if your work flow permits doing things piecemeal I think you would be fully satisfied with only a spot gun. Pay particular attention to the fan pattern though, if you can find out what it is beforehand. The SRi has an excellent fan pattern of up to nearly six inches which is more than most. The only downside that I noticed is in spraying surfacer with it. The tip size was really too small for the more heavily bodied surfacer and the pattern narrowed up considerably. Not a very big deal though since surfacers will be sanded a lot anyway prior to the topcoat. It worked fine with epoxy primer. Painting on my B has been with relatively small parts. Even the hood is small compared with car sheetmetal. I use 2 oz paper cups a lot for mixing measures and have even used tablespoons for that purpose. It is just too much of an unnecessary hassle to fire up my standard pressure-fed two quart remote cup arrangement for painting these small quantities. If you approach painting a tractor like painting a car (all at once) a full sized gun is absolutely necessary. Piecemeal, it is not. Unless it is a huge tractor :o). Spot guns also use a lot less air and are easily supported by the smaller compressors without being constrained by short spraying times. Provided as some food for thought.  Rod
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