Originally Posted by mistersnorfles
Why would you choose AES256 over the others?
Well, the choice comes down to personal preference, but if you read (for example) the Wikipedia page for AES
you can get a good idea of why it's such a well-regarded block cipher.
what benefits are there for asymmetric encryption versus symmetric?
Which attacks make symmetric encryption more vulnerable?
Once again, Wikipedia has a very informative page
about this. There's also tons more info to be found via Google