All of the above (from Freud, or better). A dado set may give a slightly different profile than a box joint set. Often dados have glue reliefs at the edges (cutters slightly deeper than chippers).
I used an 8" HF dado set for years with my old 10" Walker Turner contractor style TS. It only had a 1 HP motor but that never held it back. Anyway, I had no issues with the HF set except that the shims would get caught in t he saw arbor threads and get deformed. Easy fix with magnetic shims.
My use was occasional and the quality of the dado bottom was not an issue o r concern.
I have recently replace the WT saw with a Saw Stop cabinet saw. Love it. I also upgraded my dado set to the 8" set from Ridge Carbide. Day and nigh t quality difference in the dado set and the quality of the cut.
Now, the Ridge set is easily 3 to 5 times more costly then the HF. You jud ge how often you will use this and whether it is worth all the $$s. For me , I wanted a quality set. For occasional use, the HF will probably be just fine.
BTW, I can't say enough good things about Ridge Carbide. Both their blades and their service.
I bought the Freud box joint set a few years back when they first became widely available ($60 at casa.com).
Absolutely perfect fingre/box joints! I then "discovered" that with the perfectly flat grind on the teeth (and both blades the exact same diameter), it is perfect for grooves and other cuts that need square shoulders and a flat pocket (half laps are where I put them to use, big time).
Even with the FTG profile, there is no tearout on the shoulders as long as a backer board is in use on the miter gauge.
Overall, probably my favorite blade second only to my WWIIs
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