Palo makes both Scott-ordered pages and Gibbons-ordered pages. I don't know how much overlap there is between the two lines or whether you can get everything you need in the SG line.
For the Scott pages, everything is indeed in Scott order, so semipostals, airmails, postage due, special delivery, etc., are "back of the book" or in this case "album".
They do include some "lower-case letter" spots, but I wouldn't rely on it. Otherwise, the coverage is comprehensive.
I scanned an entire set of Palo hingeless Mexico pages that I purchased here:
https://goscf.com/t/33786That should give you a rough idea of how comprehensive they are.
If you want to get creative for certain sets, Palo will sell individual pages ala-carte, but of course that's more expensive.
The great thing about Palo, is that if the country is listed in Scott, they make pages for them, except possibly some of the entities whose stamps didn't actually get used in the mail, like 1970s Equatorial Guinea, etc.
They are indeed expensive, but personally I loathe the amount of time it takes to measure, cut, wet, and adhere mounts... and the annoyance when you fark one up. Life is too short.
