I'm much more familiar with Ahrefs, So I'm not sure I'd be able to make a fair comparison. What I do know is that AH refs is the industry standard and used by many professional bloggers. It definitely offers a crazy amount of features, including many for keyword research. It's pricey for sure, but if you can afford it, I definitely think it's worth at least trying for a month. I was paying for it every other month ( and canceling the off months) to save a little money, but I found that I liked it so much that now I just keep it every month.