A number from 1 to 70 on the Sheldon scale describing condition. MS-60 and above means no wear; 70 means perfect as struck, with no post-mint defects visible at 5x magnification.
Both are top-tier and neither is universally better. Compare the specific coin (date, grade, eye appeal and price) rather than the holder. Both verify certification numbers free online.
A perfect proof coin with deep cameo contrast: frosted devices against mirrored fields, with no defects visible at 5x. DCAM stands for Deep Cameo.
A countersigned label means the coin was selected at an elevated quality threshold by a named expert, which can add provenance and collector demand.