This is your personal opinion and you are entitled to it. But IMHO the KLM lounges in AMS beat pretty much any DL lounge I have seen except the business elite lounge in ATL.
That's not saying a whole lot for the KLM lounges -- sort of akin to comparing rotten apples to rotten pears. That noted, my complaints about the KLM lounges have declined since they started providing me shower and internet access at no charge a few months back.