The Grande Suite on RCL Enchantment is like a concierge cabin on Disney. In addition to the cabin itself, you also get:
Priority check-in
Personalized attention throughout the cruise with complimentary
Concierge Club service on select ships
Reserved prime seating in the main theater for entertainment shows, where available
Priority tender tickets on select cruises. (Tender service is provided when smaller vessels are necessary to reach shore in locations without docking ports large enough for cruise ships.)
VIP pool deck seating, where available
Full breakfast, lunch and dinner dining room menus available for in-room dining
Complimentary luggage valet service
Luxury spa bathrobes for use onboard
Complimentary pressing service on formal night
Priority departure with exclusive suite* departure lounge featuring continental breakfast
If you're trying to compare apples to apples, you need to consider everything - not just the square footage.
Also, the Deluxe family oceanview on the Dream is 299 ft including the balcony whereas the grand suite on the enchantment is 353 square feet plus 107 for the balcony.