Altis all the way!!!
therez no comparison of Altis with VTI Oriel in any way!! The only negative point i am seeing in your options is that Altis has CNG installed!! Do take a mechanic along and ask him to check the car thoroughly specially intake manifold. Its the first thing which goes off or gives trouble on CNG (issue with most of the vvti engines). A new intake manifold will cost you between 20 to 25k!
Another point is maintainence. Toyota's spares are dirt cheap compare to Honda and they are easily available even in Bilal Gunj, SherShah (Used Spares Markets) etc.
Altis has more room than Vti. To be honest, its more fun for me to drive my Altis than my VTi. Specially i love the annoying sound of its engine but it really feels powerful
I am driving my altis on Petrol and its giving me mileage of 9 to 10km / litre now compared to when i bought the car it was giving me mileage of 7 to 8km/litre.
Summing up, i will recommend you to go and test drive both cars and get them inspected by any mechanic. As used cars always require some work + Time + money to get back to the original settings. If both are in great shape, then go for Altis. You will not regret your decision, thats my assurance.