Personally, I prefer software written in C, because
I can understand it and change it. But Go, C++, Dlang
and even Rust are fine programming languages too.
I personally like simple software
(say suckless-like) because
that's how things should be, right? Simple yet powerful.
I prefer Free Software over all other kinds. That is, software
which enables freedoms 0, 1, 2 and 3 (see Four Freedoms)