I was also in that dilema b4, I chose Avanza for the ff. reasons:
1. Its a compact vehicle very easy to maneuver especially in Philippine road na napaka narrow and so many obstacles like vendors, tricycle, pedicab, jeepneys, etc. Very easy to park too.
2. It's fuel efficient imagine 12kpl against 6-7kpl. Almost driving 2 Avanzas in 1 Innova gas. Lalo nat pa grabe ng pa grabe traffic and pa mahal ng pa mahal ang gas.
3. Very versatile just like owning a car, an AUV, pick-up, and a mini van. Like car because its small you can use it as everyday car. Nakakapagod pag dala mo araw2 malaki. My percent usage is 80% I'm alone in the car.
4. Its a new series and design, so yung next generation avanza e matagal pa, 5 yrs from now maybe, therefore higher resale value. 4 years na Innova pag may dumating na all new Innova bigla bababa resale ng 1st generation Innova
5. Most importantly is the price.

Re: Sound Insulation-AFAIK halos lahat ng car wala sound insulator except yung mga hi-end vehicle like mid and full size sedan like camry, accord, benz, bmw, jaguar, mid and full size SUVs like RAV4, Prado, Pajero, Tahoe and luxury vans like E150, Suburban and etc... Kaya sila malalaki bcoz of insulation.

Futuristic din ang design ng avanza. In near future compact na mga vehicle. Di na uso mga naglalakihan SUV bcoz of global warming. Ewan ko ba sa Pinoy ang hilig sa malalaki car. Sa Italy and Japan puro compact na vehicle bcoz of gov't regulation.