As per my knowledge Feature release is the one which contains new or added features to the old release.
Service release is the one which is revised of the old and fixed the bugs/issues in the old release, but not added with any new features.
If i am wrong please correct.
Can anyone add any more difference if their between these releases?
Feature Releases are releases where new features are made available. This track is good if you want to have all the latest features as soon as possible, but it is more probable to have minor bugs
Service Releases are releases are more focused on stability, and are more often! Recommended if you're not very concerned with the new features.