ADDICT depicted Charlie with the current hair design so the series doesn't even get a win on that.
The most common reason for why the series' design is considered superior is because Charlie looks more like a hotel manager. I'm sure there are ways to convey that without the excessive red. And if we're talking about her actual body, people say her curvier facial features makes her look more mature, which is quite ironic considering Charlie's a lot more childish in the show compared to the pilot.
One definitive aspect about the series' design that can't be defended whatsoever is her undershirt. Charlie's vest in the series exposes so much of her torso area that her suspenders should be visible yet they're not unless she has the vest completely off.