The phrase "by a significant margin" means that something has been accomplished or achieved in a noticeable and substantial way, with a clear advantage over others. Full definition
Unless you factor in exclusive DLC, features, etc. then yeah one version would likely be better than the other by a significant margin. (n4g.com)
Actual returns from hedge funds trail buy - and - hold returns by a significant margin. (alephblog.com)
The authors test portfolios bought - and - held for up to 5 years, concluding the low enterprise multiple stocks continue to outperform in the fifth year by a significant margin. (greenbackd.com)