Tubeless or tubed? Looks like Schwalbe has tubeless-approved versions of many of their tires now, but not all.
The Marathon Supremes test slightly less draggy (16.9W at BRR) than the fastest Gravel King (the slick TLCs @ 17.3W), and the Schwalbes rate MUCH higher for puncture resistance. FWIW they're marked 650x42 on their
website but it's definitely worth researching how wide they come out in the real world as yeah, this can vary a
lot from specs. And there could be a difference in clearance front & rear on the bike