If you wish to keep your warranty valid, go for 15" rims..
I was at the dealer today for my 30 day/1000km check up and asked the dealer about what all will void the warranty, and he said that if you add 16-17" rims and have a warranty claim for suspension, Honda will not cover any expenses because the owners manual suggests 15" rims. I said that the Malaysia model of City has 16" rims, to that he responded that in Malaysia and other countries road conditions are different.
To answer your question though, i'm a fan of multi-spoke rims: