Co-Ordinate and Talk with Friends
Just like many Pokemon games that have released before them, Sun and Moon will each have a number of Pokemon exclusive to them. Though this is never a huge number that deters players from only picking up one, the seven ones available in each might give you an idea of what game you’d rather pick up. On that note, you should also get talking with your friends and family to see if someone is looking at picking up the other. A few worthwhile trades for each of you could see you overcome the exclusivity issue.
Heck, even talking with friends is a great way to get yourself prepared for Sun and Moon’s release. Picking up on little details you may have missed in the buildup to its release, and speculating on what the game may have awaiting players is always a great way to get your suitably hyped for the big day. You could even do it all over a leisurely Pokemon GO walk.