Fiji or Vanuatu?

Calling all experienced Pacific Island types...

On the way home from NZ next April I'm toying with making a stop on one of the Pacific Islands. The options are Vanuatu or Fiji. I've heard plenty of good things about Fiji but have read that Vanuatu is beautiful and laid back. I'll be arriving on my lonesome so am wondering if Vanuatu is more of a couples destination or if I'll still find it easy to meet other travellers there.

So what are your thoughts if you had 10 days to spend in either Fiji or Vanuatu in April? Which would you go for, and why?

I prefer Vanuatu, but 10 days can more easily (and cheaply!) be spent in Fiji.
Vanutu is not REALLY a couples' destination, but independent travellers are far thinner on the ground than in Fiji. And yes, it's more laid-back and maybe more scenic than Fiji...

As a single youll find it easier to meet n mingle in Fiji.

Thanks guys... Fiji it is this time around.