Originally Posted by Molly
... trying to determine the "best" or safest future proof option to go with for long term archival while also maintaining reasonable performance...
I'd mention that Rijndael was (arguably?) chosen as the Advanced Encryption Standard precisely because it's a good balance of secure + relatively quick.
I'll also add that there is no practical
future-proof encryption. For now, AES-128 or AES-256 - with a strong key - is something I personally feel quite comfortable with.