Both are correct. Most people will probably prefer one over the other because they think it sounds better. I have no preference.
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anonymous What is more correct - More Gross or Grosser?
At this point in time, grosser and more gross, as well as grossest and most gross, are all equally correct.
However, if you were around more elderly people as a child, you might be more inclined to use more gross and most gross, since it is likely that past generations said more gross and most