We usually travel I-70 east and west a couple times a year. I've tried I-270 a few times. I think I-70 is the quickest and easiest route. That's the way we always go now. Just don't hit it at rush hour and you'll be fine
Traffic gets backed up either way.... The actual "downtown" portion of 70 is only tight for a couple miles and then it's smooth sailing again. Which way are coming from? What roads?