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I'd assumed that Scott albums had more varieties and numbers for the ones in them. Minkus had their numbers, but at least they had them. Has anyone had experience with both and what is your opinion?
Good questions swrdo.
Funny, I just came across a collector at one of the stamp forums that was planning to migrate his Scott International collection to the Minkus Global Supremes.

I would be inclined to just keep the stamps in the Minkus Global Supreme albums. Contrary to what one would think, the Supremes offer more spaces for the 1840-1940 era that the Scott International Part I (1840-1940)...."Big Blue".
Both albums are still supported and can be purchased "new" on good paper through Amos Advantage.
The Minkus numbers are "deader than a doornail" in my opinion. But Minkus offers enough clues in the album spaces, that placing the right stamp is usually not a problem.
The stamp spaces are tight in the Minkus, as they jam a lot of stamps on each page. The Scott Internationals have a more leisurely space format.
The Scott Internationals present the advantage that they are designed to work reasonably well with the Scott catalogue. There are no catalogue numbers in the album (Except for U.S.), but there is a checklist available at my bigblue1840-1940.blogspot.com for Part I

But you still may find there is not much point in switching now.