Yeah I've been meaning to add the K240 as they're quite good and popular. I'm not immediately familiar with the HD 598 but Sennheiser generally makes good stuff

Yeah I've been meaning to add the K240 as they're quite good and popular. I'm not immediately familiar with the HD 598 but Sennheiser generally makes good stuff at each price point. They have a habit of changing model numbers periodically though for seemingly no reason.