I feel like fixed cards (over progressive) is mostly viewed as the default mode here. But I couldn't remember a version of the board game myself, that actually uses fixed cards (without combining it with secret mission Risk). So I was wondering if anyone does? Interested to know how that came to be.
Figured I could already go through the rules of the (standard) US versions myself. The 1980, 1990, 1993 and 1999 version include a suggested variation of progressive cards, where the sets go 4, 5, 6, et cetera. (1993 introduces secret mission Risk.) In the 2003 version, fixed cards are introduced for both secret mission Risk and team Risk (but not without).