Single stage, significantly larger selection of dies.
Biggest problem for me is that eventually you will need to full length size your brass, and you're going to end up with a non arbor press to do that in any case...
Most ranges have concrete benches, and with a c-clamp or quick-grip clamp it is not that hard attaching the press.
Having said that, if money is no object, arbor press and wilson dies are nice and compact, but I'd rather spend money on other things...
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