It will be interesting to see how clear interleaving holds up over the years. I really don't know, though. If glassine doesn't age, that's a plus, but I've seen a lot of it age badly. Might be from bad storage habits, though, like too much heat. I guess time will tell.
I find glassine gets stuck between the pages in awkward ways and ends up getting creased. Clear interleaving has "static cling" that usually keeps it from doing that. As I turn the pages in my albums, the clear interleaf adheres to one page or the other. If it adheres to the page I'm turning, that's good. If it adheres to the upcoming page, I just turn the next page plus the interleaving as one page. My main issue with glassine is that I like to look at both pages of stamps at the same time. So clear interleaving just looks and works better for me. I's worth a few more dollars to me to buy the clear stuff. Something like $15 vs. $12, give or take. Then there's that crinkly noise as you turn the page! Not a fan of that.
I've bought clear interleaving a few times on
ebay, but mostly from Subway Stamp Shop. They sell it for both the Scott International and the Scott Specialty-National albums. I'm surprised Scott (Amos Advantage) doesn't sell clear interleaving, and I have no idea why. It seems like a no-brainer to me. But Scott does some strange things -- like discontinuing the sale of smaller size Scott International and Specialty binders, replacing those binders with enormous 3-ring binders so big they hang way off bookshelves, choosing 3-ring album pages instead of multi-ring pages (which look much nicer), not selling title pages for either the International or Specialty albums, not scoring the folding edge of album pages so they lie flatter in 2-post binders (cheap and easy to do), even sometimes misspelling names of countries on their pages (It's "Tunisia," not "Tunesia". Sometimes I think someone's not paying much attention At Scott/Amos anymore.