Both / neither
Most people don’t EQ at all. The most common advice people have given me was to spend sime time with less expensive headphones discovering what sorts of things are important to me. Did I like a flatter FRC, a more V shaped one? U shaped? Do I like really elevated bass, or maybe a bump in lower mids?
By spending some time buying / selling through less expensive HP, you don’t go broke while you figure out what you want. Then, when your tastes are more developed and established, and your ability to describe what you want is more solidified, you are ready to ask for and evaluate advice about better (and often more expensive) headphones that will suit those tastes. With that experience, you are also more able to evaluate reviews on your own.
Most people would probably say that it is better to get a HP that fits your tastes perfectly, without any need for EQ at all. Many would also probably admit that the ‘perfect’ HP probably doesn’t exist. On the flip side, I would also have to admit that EQ does have its downsides, and the more you have to use it to change a HP, the more you’re sacrificing.
So there’s a balance to be struck. EQ can have negative impacts, so tread lightly, which means starting with a HP pretty close to what you want anyhow.