Sanat, I recommended i10 if your driving distance is not much, say if it is 15-20 KM a day then you would definitely go for Petrol. i10 has the latest petrol engines and are close to a gen ahead of the wagon r ones so you can expect better fuel efficiency certainly...
In my case I had to go in for WR duo because my driving distance everyday is close to 55 KMs. so LPG makes a lot of sense for me and keeps my wallet happy ...Also as I mentioned ingress and egress out of car was a big factor for me, something which wagon r is very very suitable for...There is nothing wrong with wagon r except for the initial gear problems which get rectified after a few services,,,,also as Pankaj mentioned high speed performance is slightly suspect, but then again I rarely will do long trips and will keep my speed below 100...
Plus wagon r looks is always a moot point. For me economy, VFM and space trumped looks, BTW I kind of like WR's looks, its gender neutral 
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