Should I do two resorts?

I will be visiting Fiji with my wife and kids (3 and 9) in April for her 40th.

I was able to book Vomo island resort for only 4 nights for a beach villa as they did not have availability for all 7 nights.

I am considering booking 3 nights at Nanuku, but noticed Vomo has those same nights available at their hillside villa. I wanted folks opinion on whether it would be better to just stay all 7 nights at Vomo and move between the beach and hillside villa or would it be better to split the trip between Nanuku and Vomo to experience two resorts and parts of Fiji.