Since I hardly ever use a Dualshock controller, to me an X is an X. I could be tempted to call it a cross if I were a Playstation user, just because it fits the 'geometric shapes' pattern, however the English vernacular has long been infected with calling a diagonal cross an "X" and a vertical/horizontal cross a "plus". Thus you don't see people calling the DS controller's X button a "cross", just as you don't see anyone calling the Switch's '+' button a "cross". Nowadays the only things anyone would still commonly call a cross are the religion-related ones.