Re: No rear aircon for the GA and GL APV models, here's what the sales person from Suzuki told me:

Yung mga Hapon daw kasi did not place the rear aircon for the non-automatic versions kasi they classify (I think "classify" was the word he used) the GA and GL model as "Utility" vehicles and the GLX (automatic) APV was the only one fitted with rear aircon coz it is the "for family" version of the APV.

If the APV wasn't available, yung Avanza J na kukunin namin at wala na ako makita na practical na pang pamilya na available.

Overall, I think wala naman talo sa dalawa at may sari-sarili silang appeal at ang importante yung needs mo/nyo ay mapunan ng kung ano man pipiliin mo. =)