Advanced Encryption Standard (AES) is a cryptographic block cipher algorithm.
Triple DES is a symmetric encryption algorithm that uses the DES cipher three times to encrypt each block of data
"I personally would use aes for my encryption as it is lighter and more secure than tripledes in fact i think it is the de facto algorithm at the moment"
from question "TripleDESCryptoServiceProvider FIPS 140-2 Compliance"
"But tripledes is older and weaker than aes"
from question "Rfc2898DeriveBytes and TripleDes"