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I like the 6" angular chrome ones that came on my truck. They look nice but are a PITA to keep clean. My previous F-150 had the rounded black ones, they were easier to clean.
My wife (who is now 8 months pregnant) really likes the new angular ones. She says her feet don't slip on them. So, for the chrome ones.
I honestly really like the OEM factory running boards. No sure what they retail for, as that might be a deciding factor, and some aftermarket ones are really nice, but I would just get OEM and be done with it.
I am not a fan of the stainless steel look, but that is personal preference. I have a black truck with the sport package, so chrome/steel running boards would look really out of place.