What are you planning to sand, the layout framing or jigsaw cut plywood? Wouldn't a hand sander be more convenient? I saw a video of a guy shaping foam for a train layout with a hand-held belt sander. I didn't use a sander when building my layout, but I don't have a lot of exotic curved edges or fascia.
I have both at work and a much larger one. The small one inch wide is good for very small projects or fine detail on wood or plastic. Not recommended for building lumber 2X4's but can get the job done with patience. The slightly larger is more useful on larger pieces like plywood and finish work and shelving. What exactly do you want it to do?
JMARTIN, I have "A" and it does the jobs I have used it for, including sanding wood, plastic and flattening track ends. The disc on the side is a little awkward to use. I like the fact it is small so it can be stored out of the way easily. Grit selection on the belts is important for doing a good job. Remember it is not a commercial grade power tool so feed rates are important.
JMARTIN, I recently bought a Ryobi identical to your "B". It's been invaluable for tweaking small parts and keeping the edges nice and square or fine tuning angle cuts. I wish I had picked it up a couple of years ago, the big plus for me is you can hook a shop vac right up to it to keep the dust down.
I have both models and they are great for wood and metal. Be sure to match the grit to the project as 80 grit will remove material real fast! Most Mfgr's include an 80 grit belt with the sander because it's cheaper than finer grit belts.
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