I'd go for the Starex. The economy of the diesel engine alone makes it a winner for a second hand vehicle purchase. While both Toyota and Hyundai have plenty of spare parts available for both models, the Previa is not as common as the Starex. Thus parts may be limited in the areas outside Metro Manila.

However, comparing a Starex to a Previa is not an apples to apples comparison. A better match would be a Carnival, Town & Country or other soccer mom-mobiles to the Previa.