There are more traditional adapter boards that supports several different QFP sizes.

The functional difference is that the traditional adapter boards are just adapters. They have pin headers or similar for connecting the adapter with the rest of the electronics.

This board has a number of holes for each processor pin, allowing you to solder a bit of glue components on the same board. This isn't always meaningful, since the board has a very limited capacity for component in series, unless you use hole-monted components to bridge between two Schmartboard modules. The multiple holes/signal line works best for components or shorts between pins on the same chip.

Another strange thing is that the Schmartboard has a ground plane. And it is intended for mounting components around the IC. But they only have ground pads in the corners of each board. Real designs tends to require quite a lot of connections between signal and GND or signal and VCC.

With this board, the distance to ground is just one PCB thickness, but you can't get access to the ground in that direction but must route to the corners. And the distance to VCC will be a quite long and narrow PCB trace followed by a probably quite long wire.

I think the point with the boards is that you can attach multiple boards for your one-off prototype. Potentially requiring a bit of creative work if you need higher currents or higher frequency somewhere. Their solder-by-numbers products do indicate entry-level projects for schools in which case you can do a lot of fun things.