i'd go for c172, 737, 747...
Vortex spacing being the reason - you wouldnt have to apply any vortex spacing in this order, only radar separation. So in theory you could have the c172 touching down, the 737 3 miles behind and the 747 3 miles behind that... other way round with 747 first, 737 would need 5 miles behind etc etc.
Of course assuming all other things equal...
