Saints are just saints.
There's nothing special about them (beyond the halo). We used to put them on dish cleaning duty in the Monastery Kitchen but the NodeReaper kept scaring them when he made his pies and we had to stop. Actually nobody has cleaned any dishes since then either. Any volunteers?
Of course, Level 26 monks also get more votes than Level 25 monks. See the Voting/Experience System for details.
If you're curious about Saints in our Book, that happens at Level 13: Curate.