So I am looking for the most secure method of symmetric key cryptography for long term messaging use between two users. I have heard that most symmetric key algorithms are not absolutely compromised by quantum computers, but rather weakened.
I have read that AES 256 is in fact the weakest, followed by AES 128, and AES 192 being the strongest.
Let us imagine that today quantum computers exist with "good" capacity to break cryptography.
Is AES still the best symmetric key solution as of right now? If not which is? If so then which AES key space is the strongest?
These are many questions which remain unanswered or lack good discussion as there isn't much in regards to post quantum security concerns.