Both the Celerio and the Wagon R come with the typical Maruti benefits of being fuel-efficient and cost-effective when it comes to service.
Between these two Maruti Suzuki cars, we would lean towards the Celerio. The Maruti Suzuki Wagon R has better headroom, but overall passenger space in the Celerio is more than enough, and the boot volume is also very good. For your highway trips, the Maruti Suzuki Celerio will be a tad better with a more surefooted and composed feel at speed.