Not Only But Also (Emphatic Addition)
6 related grammar points that express the same core idea - compared below so you can tell which one to reach for.
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- ～はもちろん～も JLPT N3
- ～のみならず～も JLPT N2
- ～ばかりか〜も JLPT N2
- Noun にとどまらず～も JLPT N1
- Noun もさることながら Noun も JLPT N1
- Verbる にとどまらず～も JLPT N1
のみならず / ばかりか
The second item is more than you would have expected, not just additional.
～ばかりか〜も vs ～のみならず～も: Use ばかりか. It escalates ('not only X but even Y'), and the surprise is the point. のみならず is a neutral formal addition, so it flattens the escalation into a list.
にとどまらず / もさることながら
Both items matter, and the second matters more.
Noun もさることながら Noun も vs Noun にとどまらず～も: Use もさることながら. It grants the first its due and then puts the weight on the second (味もさることながら値段が). にとどまらず only says the scope did not stop at the first, without ranking them.
What does not stop at the first item is an action rather than a noun.
Verbる にとどまらず～も vs Noun にとどまらず～も: Use the verb-attaching form, Verbる にとどまらず. The noun form takes a noun. Same expression, two attachment points, and the choice is settled by what precedes it.