Just a quick follow on, but the way I understood it, what D&D wanted to achieve was essentially to create a general online hub for all things D&D and to move their source material online, but keeping it proprietary, like with a paywall or monthly subscription type model.
Meanwhile Pathfinder was just cranking out old school campaigns and publishing a gang of traditional hardcovers under the previous ruleset. Such that if you walked into a random bookstore, Pathfinder probably had more shelf space than Dungeons and Dragons. It had the backwards compatibility too that the 4E materials lacked and also captured that segment of the D&D audience who had a strong open source linux-like sensibility.
Most of the 3e and 3.5 modules and material are still compatible with the Pathfinder ruleset, whereas porting that stuff into 5e requires some heavy lifting in the adaptation. So part of Pathfinders appeal is that it still works with a lot of the old official D&D stuff, whereas new D&D often doesn't. At the same time D&D still gets to mine the setting, since Paizo can't publish stuff that is specifically FR. It all has to be scrubbed first.
I'd have a hard time choosing on a desert island hehe
