The 10 Best Plate Joiners
Editor's Notes
September 16, 2020:
Added the Festool DF 500.
The effectiveness of biscuits in edge joining (like joining solid boards edge to edge to form a tabletop) is highly contentious. This is partly because wood glue is already such an effective way to hold boards together (such that you'll often see the surrounding wood fail before the glue fails) that it doesn't seem like biscuits add to the structural integrity of the joint.
Joining end grain is where the plate joiner may earn its keep. Edge grain and plywood side grain are porous and require some sort of reinforcement. If you're making a butt or miter joint, biscuits may very well help to reinforce a joint that would be quite weak with glue alone. Out of excess caution, I tend to prefer using mortise and tenon joints where possible. This is why the Festool DF 500 has become so popular. It essentially makes floating mortise and tenon joints because it uses a cutting tool similar to a router bit (instead of the saw blade used by most biscuit joiners) and solid wood pegs that act nearly identically to a regular shaped mortise and tenon joint.
January 09, 2019:
The durability and consistency of the fence should be your primary consideration, as that is what will help you make consistently straight cuts. One of the most common failings we found with many models on the market is poor dust collection, so make sure that whichever one you choose has a competent port or bag attached.