The VTI and exi have different engines.
1.6L dual VTEC in vti
1.5L non-VTEC in exi
Vti has a sunroof in the 'oriel' .
Exi doesn't come with a sunroof.
Pre facelift Exi came without four wheel disc brakes. After facelift it came with 4 wheel disc brakes.
Our civic prosmatec is giving 9-10 kmpl with ac these days.
In winters it gave around 11.5 kmpl and once it went just a bit over 12 this feb.
Honda spare parts for this model are common. Even Bilal Gunj is filled with same shape England model and Japanese parts.
In terms of maintenence: parts, oils and filters are on the higher side. But if you do timely maintenence and use genuine parts only, then your car will run trouble free. Ours has clocked 172K and still running strong.
I don't think there are any factory faults. I'd suggest you get an eagle eye civic as it will be newer and personally it looks better. Please have the car checked by a denter and painter. Get the full service history cause if you get a beat up Honda, you're gonna be spending a lot of money on it. So do a thorough check of the car before buying it.