For me, I have a Business Reserve card for the Sky Club, MQDs, 1.5x miles after $150k, and of course the First Class Companion Certificate. The 5x vs 3x miles on Delta spend is really small potatoes unless you're spending tens of thousands on Delta fares, which I am not. I get $2-3k worth of value annually from the Companion Certificate, even though it can be a pain to use. With the $2500 MQD boost and 1.5x miles I get on purchases after mid-year there's really not much incentive to go with the Platinum, which costs more. Finally, unlimited Sky Club access is a huge perk and was really the main reason I got the card in the first place, years ago.