For decades the standard interconnect was RCA. Somewhere around twenty years ago balanced designs started becoming common and balanced interconnects became increasingly common. Now I would say the default for most companies are balanced... some offering newer methods. So, I switched to balanced about ten years ago.
Folks invariably end up with a number of extra interconnects laying around. Which can be useful. So, it is very helpful you standardize on what is mainstream... since that is where most component companies are going to but their greatest effort. So, for now XLR is it.