you just have to think about what is more important to you. the s2 is more expensive, looks better to you, and has jog wheels. i would say at that price range go with what is more functional for you, which sounds like that may be the twitch. there seems to be some good traktor mappings for it as well, so i wouldn't worry too much about that. good luck deciding.
here's the 2 highest rating twitch mappings on this site:
https://maps.djtechtools.com/mappings/82
https://maps.djtechtools.com/mappings/297
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