As long as you are not using altered point values (unless you are using the Liber Panoptica houserules), most TOs (Tournament Organizers) are fine with hyperlinked, errata-updated PDFs. Yes. Absolutely.
The Horus Heresy is a game of dense complexity. It requires tracking 20 unique Legion rules, hundreds of unit entries, and the finicky Reaction system. Relying on GW’s barebones official PDFs (which are often just digital scans of the physical book with no interactivity) is a fast track to a 4-hour slog. horus heresy 20 rules pdf better
But what does "better" actually mean? Is it better organized? Better balanced? Or simply better for your wallet? As long as you are not using altered