I just switched back my 2 full nodes to use bitcoind which source tarball is from github, as I trust it more.

I am not a coder. I don't know the impact of the 100+ differences between https://bitcoin.org/bin/bitcoin-core-0.15.1/bitcoin-0.15.1.tar.gz and https://github.com/bitcoin/bitcoin/archive/v0.15.1.tar.gz. Unlike on the source code on github which I can track all changes, there is no information on the changes applied to the source tarball on bitcoin.org.