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Underwood ammo tends to meet or exceed there rated velocitys . The advertise a 40sw 155gr at 1300fps and mine averaged 1318fps from a 3.9" sig p320 , 1320fps from a tp40 kahr and 45acp 200gr averaged 1121fps from a ct45 kahr . Plenty of guys have had good chrony readings with 10mm form underwood

10mm is maxing out for bullet weight were the 45 super starts to take off , 10mm cartridge has a 5000 + higher PSI over a 45super and if both are shooting comparable bullet weights the 45super will have less snap or softer recoil over the 10mm so that's your main difference .
 
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