Saying RSUs tend to be better is potentially true (at least a higher expected value) since they are likely to be issued by public companies rather than early stage companies.

If you're doing well and the company is sensible they will continue to offer you additions equity grants so there isn't that incentive to leave as your compensation falls. This post describes the "evergreen" aspect to granting equity: http://firstround.com/article/the-right-way-to-grant-equity-...