Big Goggles Little Goggles

I do recommend the larger, aqua-sphere goggles, which look more like snorkeler's than swimmer's goggles.  Getting some peripheral vision while racing has helped me avoid many elbows and side-swipes, plus I can see the marks better.  Half glances with full field vision are just more effective than repeated direct sighting with smaller goggles IMHO. 

I also find that the bigger goggles tend to seal better, and are thus harder to knock off or break the seal/leak.  

That said...I'm going to buy a pair of smaller TYR goggles for lap swimming at the pool.  Smaller ones should leave smaller face/eye marks than the bigger ones, I hope. 

It is all about fit. I had some seal mask bigger ones but leaked all the time.

I went to their kaimin goggles that have similar vision but are like swim goggles. They come in two sizes and I wear small and they have tinted version perfect for ows with sun glare.

Key is what fits you best and doesn't leak. 

From myt experience, if you contort your face at all while you swim, the mask style might not work as well.  I tried them, and I would contantly break the seal at the forehead. 

Its all about the individual needs though.  Try 'em out, a lot of people love them.

I've been using the Seal Mask XP for over 2 years now for all my training and events.  I recently purchased a set of tinted Aqua Sphere Kaimans and also have been using them only in the pool.  I'm doing an OWS on the 1st or 2nd and I want to see how they work for it.  They haven't leak at all so far. Getting the XP hit during the race can suck, btdt.

The only goggles I would say to avoid for OWS races are the swedish style goggles that fit right in the eye socket. TYR Socket Rocket's are the type as well. One kick and they can really do some damage.

If you ever see anyone after a triathlon with broken blood vessels around the eye sockets you now know the reason. Fortunately, this is not from experience.

Other than that advice, whatever fits your face and doesn't leak will work great!!