: the sole incompatibility (on some systems) is between Gabi's ReLoad (a little utility which runs RB allowing to set wind drift, engine failures, hard unjam and reload, realistic engine management such as mixture control and more) and Promised Land or derived (like Gump's and Mark's terrains) cause colors palette change required and often unmanageable by RB if running under ReLoad. Since you don't mention, you may use whichever set of terrain tiles. Personally, I always suggest the OTE/PL combo you may find at:
Hell's Angels Scenery
is enough on its own.
Latest version of WFP
is WFP2. Although it may looks strange, it is because after Pat Wilson did last version of its own WFP, the WFP7, then got authorization from Kess (Promised Land) to issue his uncompleted WFP II, originally intended as a much renewed WFP made using FCJ textures, terrains and special features. Since Kess had been forced to drop the project, Pat took all the improved stuff at the "state of art" and packed this new WFP, where "II" became "2".