Which algorithm is generally considered to be more secure, and is AES-192/AES-256 still considered to be secure?
After reading this it's lead me to belive that the Rijndael algorithm would be a more secure choice, but is this actually true?
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AES is a subset of Rijndael (FIPS-197). It's still being considered secure, if you continue reading to the bottom of the article:
Even if the largest botnet ever discovered – the 30-million-computer-strong BredoLab botnet – was given the task of attacking an AES-256 implementation, the sheer number of possible combinations would make the task virtually impossible.
The attack you suggested is called a biclique attack and is slightly faster than it would take to bruteforce an AES key. Considering that would still be a a few trillion years it's not really feasable.
Also this is the official press release from the Katholieke Universiteit Leuven about the code being broken. (This is the university where both AES and the attack against it were made)