What it all comes down to is the OM body is 15% smaller and thinner which will make it easier to hold. The only bad part about the OM is a smaller thinner box will have a smaller thinner sound. If the sound is important to you I recommend full size. If you want a guitar easier to hold I recommend the OM. The neck size is identical so playability is the same. 80% of what our players buy is full-size. The video on this page might help you further. https://zagerguitar.com/compare-sizes/