There are lots of woodworking joints because there are lots of applications. I like the Kreg setup for cabinet work. Once you're used to their jigs you can go pretty fast.
Biscuit joints, especially if you use two offset biscuits are surprisingly strong. But it all depends on what you're trying to do, what kind of wood you're using and what kind of environment it will live in.
Fine Woodworking did a stress test of woodworking joints a while back. You can find it on their web sites as a PDF. The results are pretty interesting if you enjoy wood butchering. taunton.com/finewoodworking/ToolGuide/ToolGuidePDF.aspx?id=31926
I say use whatever tool / joint will get the job done.
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