You don't have a choice bec. Toyota dealers no longer sell the old Vios, unless you want to get one from the second hand market.

Both Vios (old and new) still use the same 1NZ-FE and 2NZ-FE engines with mated with the same 4-speed automatic and 5 spd manual.

However, the new Vios is roomier esp. for rear passengers. It also passed ("good" mark) the frontal collision by the IIHS (in the US). It also passed the side collision only with side airbags and curtains installed (both of which are not currently available in the Philippines).