I think the 90 series Prado is probably comparable in size to the earlier NL Paj, so possibly narrower than the NM/NP Paj, happy to be proven wrong though.
Other big difference is Prado has split 3rd row seat, so can use one or both. NM/NP Paj has a 2 seater bench as a 3rd row seat, so takes up the whole width of the boot even if carrying one kid.
Ultimately if 3 kids - Paj may be better, 4 kids - prado may be better, 5 kids - Paj may be better.
Just remember, take your tape measure or trial fit the kids to make sure. Looks can be deceiving. Had my NJ Paj parked next to SIL's GU once, having just unloaded all our luggage. Decided to compare the boots with the tape measure - internally Paj same width, Paj taller, Paj shorter between 2nd row seat and boot door, ultimately similar volume, different shape even though the GU is a "large" 4wd.
Peter H