I, too, am in the market for a used biscuit joiner.
Not familiar with the mentioned models other than to say they are both respected names. Actually, I really don't know a heck of alot about joiners period.
What I do know, or at least think, is that quite often, power tools being older can be a good thing.
This is especially true with some established brands that established reputations making good stuff, then got bought by a megacorp that brought in the bean counters to figure out how to squeeze more profit out of the company. The result is the newer stuff is inferior. My grandpa had an old crafsman router that was made in the 60s. It was of better quality than the junk they have today. Unfortunately, years in a damp basement along with sporadic use resulted in a seized bearing.
So, my recommendation would be to take a look at the older model, especially since it is nearby. If it looks like it's in good shape and will do what you need it to do, buy it.