THe WAggie is narrow than the Beat but the Beat is low (Headroom) and wagonR is a tall boy. 3 adults would neither be comfy in a Beat nor a Wagonr.
The WAgonR has Easy ingress/Egress (Infact the best) because of the Tall Boy structure. The beat will have a very low roof which would be pain for the Head for a 5'9" person on bumpy roads.
Have you ever sat in WagonR and Beat? IMO
The waggie is better than beat. It has Better ASS
network and After sales value. Go for it!
Regarding the ASS
of chevy, Its not that great and i believe that Maruti will have Better ASS
in Kolkata. Regarding the spare parts, NO IDEA , you can Search on Google.
Anyways, Which versions will you go for in both the cars?