Revenge is like MS (they both even have a 5 sec cd!). And SS is like Execute (in that other abiliites can proc it).
For arms warriors, it's better to MS -> Execute even wasting the chance that Execute can proc itself (which SS can't do). This was true even when Execute did more damage than MS (MS scales better, and I think ICC gear puts MS ahead of Execute now damage wise).
But then again Execute isn't available to use as often as SS so it's not a perfect example (neither as a proc nor as a regular ability).