No choice of full node here: (no xt/classic/BU)
https://bitcoin.org/en/choose-your-wallet
Bigger choice available here: (xt/classic/BU + core)
https://www.bitcoin.com/choose-your-wallet
Technically, the Bitcoin Core site says that although it shares hosting with bitcoin.org, it's maintained separately:
Bitcoin.org hosts several pages about Bitcoin Core as well as the Bitcoin Core downloads, but the Bitcoin.org and Bitcoin Core open source projects are run by separate teams.
So I could understand the Bitcoin Core pages in particular not linking to downloads for other clients, but would have expected the main bitcoin.org pages to be a little more open, transparent and impartial.
Also, if we are to maintain this notion that bitcoin has no owner or controlling central authority, we need to dispel this other, entirely contradictory, notion of an "official Bitcoin site".