I tried all sorts of blades, spiral, cut and cut two-way normal.
I guess it's the same almost worldwide.
I use blades German mark, they are very good and not expensive.
I Prefair far the cutting blades normal, especially as there are several layers.
The spiral blades are not accurate and do a rough cut Deplus they wear out faster. Their price is excessive in relation to quality.
The blades cut both ways, are supposed to leave no burrs in the cut as above and below. I think this is wrong on the contrary, the cut side is up from below the workpiece on the table, which made the room shake and often break the blade.
The price is excessive.