Rejuvenation's major features are
-like Reborn, 18 gyms, dream world abilities, ev/iv checker, all 18 starters are a choice
-has easy, normal, and intense difficulty modes
-has help centers where you can do different types of side quests for rewards
-in addition to the traditional starters, it's possible to get a rare "jackpot" starter, with emphasis on "rare"
-has some custom moves. some of them are used by gym leaders, others are available through TM, and there's even a new HM that has good power
-has its own set of field effects
If those sound appealing, I recommend trying it.