Alexandrian had some interesting thoughts about what to avoid when running rival party in his Call of the Netherdeep -review (includes spoilers about the adventure): https://thealexandrian.net/wordpress/48216/roleplaying-games/review-call-of-the-netherdeep
Alexandrian had some interesting thoughts about what to avoid when running rival party in his Call of the Netherdeep -review (includes spoilers about the adventure): https://thealexandrian.net/wordpress/48216/roleplaying-games/review-call-of-the-netherdeep