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For the most part (contextually) these phrases seem to be interchangeable,
like "really?!", "for real?!", "seriously?!" etc.

Are there cases/scenarios when only one would be applicable?
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question
usage
「そうなの？！」、「マジで？！」、「本当に？！」
Well, for starters let's say that you probably don't want to say マジで？！ to your
boss. :)

Maybe native speakers can be more specific but as far as I know the main
difference is in politeness level, the meaning is the same.

So in a formal situation you would want to use 本当ですか, while if you are talking
with a close friend you can say “マジで？” that is way more casual (and similarly
for そうなの).

At this [link](http://www.it-
hiroshima.ac.jp/shushoku/zaigk/mensetu/mense2_4.html) you can actually even
see that マジ is listed as a common mistake people sometimes make in formal
situations where 本当ですか should be used.

Ps. let me make clear that hence also 本当に? is actually quite casual (I think
less than マジで though) and so when in doubt is always better to use 本当ですか
instead. Here is another related
[link](https://hinative.com/ja/questions/920175).
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