Are you left handed or right handed?
Selnikov held the 1500m world record for years breathing only to his left. He rarely breathed to his right, and did so only when he was checking on the rare opponent who might be within striking distance. Of course, you aren’t V.S. :),
Nonetheless, if you are right handed, you should breathe to the right, in my humble opinion. This will cause you to roll more onto your left side and generate more speed/power/hydrodynamics on that side. We are all out of whack when it comes to muscular balance, but you can compensate slightly by breathing on your strong side. Also, focus during practice on completing a hard strong pull with your left arm (assuming you are right handed). In fact, you might try to overcompensate with the left arm for a good bit of your drills. You will swim straighter and faster in open water ultimately.
Now, you MAY say, I’m right-handed, but I breathe to the left and am FASTER breathing to the left. Well, that’s because you are so right side dominant that you are loping severely and relying on the right side pull to the detriment of the left side. (baseball, tennis players come to mind) In a pool, this problem is not very noticeable because the pool has a line on the bottom! But, in open water severe loping can be a big problem because you won’t swim straight. Anyway, this tends to be a feature of poorer swimmers (right handers breathing left) who are, to put it charitably, swimming for survival.
I do not mean to imply that bi-lateral breathing is useless, just that it is not as natural for most people. Open water swimming can be done without bi-lateral breathing simply by lifting your head as you reach.
Are you swimming with a master’s swim team? If not, that is the single biggest step forward you can make in your swimming. If you are keying on a big race in the Fall, now is the time to join.
Swimming is fitness for life. I know a guy who swam the day before he died-at 87. Sure as hell beats a year on tubes in the hospital…
Good luck!
-Robert