I think it is for sure personal preference and how you are used to riding. Personally I like a snugger fitting saddle for speed events, barrel racing, gaming etc. I ride in a 15" billy cook. They don't have the highest backs on them but their seats are nice and deep with roughout all over to keep you nice and secure.
Although when I rope I prefer to ride in a little bit of a looser saddle, not by much but prefer a 15.5-16" so I have some room to move.
Good luck finding what works for you!b :)