stitches per inch isn't law, consistency is
the shorter the needle the more stitches you will get. that is why quilting or betweens are so short. Just keep rocking the needle.
I learned to embroider first, with a little hoop, then went to needlepoint with a bigger hoop
so hand quilting seemed hoop natural!
I have an 18" oval and a 12" round, like both. It will be what you get used to I expect. Good basting will be key either way.