Based on your question, I just wanted to make sure you realise that knowing how to program in either of those languages does not mean you'll immediately be able to program something for the Amiga platform. But its a good start.
If you haven't realised, there's more to it than the programming language. You'll need to learn about the Amiga Application Programming Interface(API) and there are different flavours to consider as well. Not to mention details about the Amiga OS architecture.
