There's no real right or wrong, because White goes with most colours.
However, if you want to know what looks the best, it's Black.
Perfect recipe for a White T6 is as follows: Take one fresh White T6, and add a set of Gloss Black wheels. The style depends on how low you're are going, or not. I've seen white, 40mm drop, and Gloss Black Sportlines, and that works well. (sorry, Sportlines are 18" but at least they are a genuine wheel)
Next, remove all your bare plastics, grills, mirrors, side repeaters etc etc, and have them also Gloss Blacked. Mix in a little Storm Trooper to taste, if that's your thing and boooooom... One bad ass T6 in White with Black detailing.
Or you could just ignore me and do it wrong
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