I would go with the 18-55 (well, I actually did), I also bought the 100D with the non IS kit lens, which was sold the day I bought it.
I bought the 18-55 STM and have found it to be the nicest 18-xx lens Canon have made, it's sharp, it's light, it's got super fast AF, completely silent for video. I have the 50mm f1.8 for low light and shallow focus, and have also added the 55-250IS and now the 10-18 STM.
It makes for a lightweight, good quality kit for all situations.