Does eating fish still have any health benefit with all the mercury that's in it? is wild caught a better option rather than farm?

No evident harm: Mercury occurs normally in the environment. Overdose / toxicity scenarios are very frightening, but in studies of folks who eat a lot of fish with measurable mercury (faroes, seychelles, new zealand), nobody's been able to show an effect on the brain, and in some studies kids eating lots of fish do better, perhaps because of it, despite more mercury.