Currently right now I have the Vog Cub set, the Skolver set, and the Dread Skelly set as armors, all of which have resistance against the mentioned statuses.
However, after being told that these sets are not very good at all and that I should flat out sell them, what do you recommend?
Never vendor any high level equipment unless you're converting tokens into money. I've regretted EVERY SINGLE piece of equipment that I sold to vendors. I have no idea who you were talking to, but they were wrong. Just... wrong. I know everyone is entitled to their opinion, but their opinion is wrong. Fire is vital for Vanaduke and Firestorm Citadel. Freeze is absolutely horrifying if you are solo. Poison is probably the most annoying status as it cripples your offensive capabilities.