I-35 or I-335?

I second what WE-C-USA said. That is the route we take when we want to hit 35 north out of KC. There are about 4 stoplights on the east end of 152 before you get back on I35. But other than that, it is clear sailing.

Traveling I-35 from Texas to Iowa, I'd connect up with I-435's westside loop. North on 435 to Mo highway 152 east bound back to I-35.

I'm traveling I35 from Tx to Iowa.

I335 is the section of the turnpike from Emporia to Topeka. It connects I35 to I70.

Are you asking about I-35 and I-435? Kansas City doesn't have a I-335.

It depends which side of KC you want to be on. If you are headed toward the north/west side, 335/70 is the way to go. If you want south/east side 35 is better. We use both depending on where we are heading. Both roads are in good shape and the toll on 335/70 is not that expensive for the convenience of getting to the north/west area.
Can you be a little more specific on where you are heading? Then you could get better suggestions on your routing.