Even with a 10” lathe I’d recommend 3/8” tooling: blanks cost less and there’s less to grind away.
With regard to those sets that Accusize (and others, including LMS) sell, I don’t like them because they have some funky profiles using forged blanks and other than for grooving a regular cut off blade in a specific holder is better.
Even though only 1/4”,
this set would be better as a starting set since you get finished ground bits plus a set of blanks to learn how to grind your own. Plus the profiles are basic ones, making it easier to develop your skills:
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@Aaron_W finished his post while I was digging out details; I fully agree with him