If those are the choices, and especially for travel with children, the IC. Good transportation. Lots of food choices in the adjoining mall or across North Bridge Road. You have to connect on the MRT at the City Hall interchange to get over to the Orchard/Scotts area, but it's not terrible. You may find little reason to go there, anyway.
For breakfast, you can walk 5 minutes to Killiney Kopitiam at 30 Purvis Street and get the grilled french toast with
kaya.
The nasi lemak is just so-so, but I always end up getting it.