Bisquits are completely useless. All they do is hold the joint in one plane and thats it. Only good if you are only concerned about keeping the faces flush. They do nothing to keep the miter from separating... which is what the natural expansion and contraction of wood does in a 45 miter. Dominos are a completely different animal than biscuits. The are much stronger than biscuits, and hold the joint together in two planes, not just one. They also tend to have more surface area than biscuits or standard joinery, so more glue surfaces, increase the bond as well.
Specifically for miters, Using a domino AKA a tenon, locks the joint together and keeps it from separating. No clamps needed. Its also a much stronger joint.
With good proper joinery there is ZERO need for miter clamps. If your goal is wham bam thank you' mam carpentry with quality be damed, then sure go ahead do standard butt joint miters and use clamps, but at that point, why not skip the clamp and shoot a couple of nails in to hold it, or better yet some pocket screws from behind? If miter clamps work for you, then great, I just dont see a need for them in how I like to do things and sold the ones I owned.
At the end of the day, the Domino is actually one of my most used wood working tools. It saves more time then the rest when it comes to making joints. Especially with furniture making, or cabinet making. Besides using it for joinery, I also found it does a great job for cutting slots for attaching tops using a floating mount, so the expansion and contraction of the wood is not an issue.
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