I did a test on Forstner bits sometime ago. The ones I had were not getting the job done. Eliminating anything that was not high-speed steel, I bought single bits to test. Without going into a lot of detail, the winner was Freud Precision Shear. I liked the Fisch bits and would have purchased those had they been readily available. At the time, they were only available to me through what I think of as boutique woodworking stores at crazy expensive prices. Today you can buy them on Amazon for about the same price as the Freud Precision Shear bits.

Note that Freud makes two kinds of forstner bits. The Freud Diablo bits are not anywhere near the quality of the Freud Precision Shear bits. According to a Freud salesman, the Diablo line is made primarily to sell in the big box stores at a price point.