I voted "Homebrew" but...
It's combines (conceptually) various different products matched up to fit together.
It uses the PHB as the default materials because all the players have access to it, and they expect to use those gods-because they are familair with them.
I have placed the Iron Kingdoms IMC but the players will likely not go there in the current campaign.
Freeport exists also but same as above.
I reccenlty purchased
Streets of Silver and
Geanavue
and plan on placing them on the current main adventure area.
Currently they are adventuring on an "island" the size of France (more or less.)
I have fit all of the Adventure Path modules on it and that is the current focus. I am so far planning on using Geanavue as the Capital City.
I was also considering placing the City of the Spider Queen sort of below that.
Streets of Silver is a lot bigger book than I expected and it could take a while to get it all "downloaded" into my brain so they may not get to spend any quality time there for a while.
I was considering getting Bluffside and placing it on the isle as well.
I need to play more so they can finish the Adv.Path and then I can move on to other things. I plan on getting
Arcana Unearthed and the Diamond Throne setting as well as getting
Warcraft d20.
I had thought about the Scarred Lands but am hesitant to buy up another ton of books I likely will not get to use. It is a really cool setting though. And it is likely the Slithern(?)(re:Skaven!) will be making an appearance!
I thought also about Midnight but have turned it down so far. It is a cool setting but I am Playing in one similar to it and am not crazy about it, although it wuold be better if it were Midnight from the aspect of what the characters can do, but at least in the other game we May be able to beat the BBEG.