The answer to 'should I get dehumidifier or' is that it depends on your specific home environment and humidity needs. A dehumidifier can be a great investment to help control excess moisture and humidity in your home, while an air conditioner can also help reduce humidity as a side effect of cooling the air.
Dehumidifiers are designed to actively remove moisture from the air, making them ideal for damp, humid environments like basements or homes in humid climates. They can help prevent mold, mildew, and other moisture-related issues. Air conditioners, on the other hand, work by cooling the air which causes some of the moisture to condense out, but they are not as effective at controlling humidity levels as a dedicated dehumidifier.