Connection for what and where? For short runs of cables, it will not matter much or really at all. People who need to run very long runs of cables usually prefer XLR, assuming of course.....(see below).....
Something to consider is....are you going to pick a piece of gear based on the conections, or on how it sounds?? If you were an XLR person and found a piece of gear you absolutely loved the sound of; would you not buy it because it had RCA's ; and would then go buy something you thought was not as good solely because it had XLR's ??
If some gear you own (or plan to own) has both RCA and XLR connections, I would try it both ways and trust your own ears which your prefer. It is your listening happiness, not your friends..
Something to consider is....are you going to pick a piece of gear based on the conections, or on how it sounds?? If you were an XLR person and found a piece of gear you absolutely loved the sound of; would you not buy it because it had RCA's ; and would then go buy something you thought was not as good solely because it had XLR's ??
If some gear you own (or plan to own) has both RCA and XLR connections, I would try it both ways and trust your own ears which your prefer. It is your listening happiness, not your friends..