Possible Persona 5 and Final Fantasy XV Simultaneous Release Date?

If Persona 5 and Final Fantasy XV came out around the same time, which one would you pick up first? This is the question that Square Enix is insinuating with their recent Japanese questionnaire. Persona 5 is scheduled to release during the summer of next year, so Square Enix may in fact be planning a summer 2016 release for their upcoming game Final Fantasy XV. The possibility of them wanting to know what other JRPGs their fans are interested in is also another option.

Could we see Final Fantasy XV next summer and which game would you buy if they were to release at the same time?