I am a daily Coca-Cola "Classic" consumer. I have been drinking out of the white/silver cans (first had them on Delta, but now have them in the big cartons) and I can detect no difference from the product in the red cans.
Unfortunately, many consumers (or naysayers who may not even drink Coke) have decided to turn Coca-Cola's charitable gesture into a political statement with which they disagree. That's their free speech right, of course, but I personally thought it was both clever (given the Coca-Cola Polar Bears, who have been immensely popular as a marketing tool) and appealing. I'm sorry Coke is retiring the white cans due to backlash. But that's just me.
Now, if you want to have a discussion about the difference between the taste of Coke in glass bottles versus plastic bottles versus cans, that's a different matter entirely (and probably not directly relevant to this thread). I much prefer Coke in glass bottles, especially the ones that used to be 6.5 ounces and are now, I believe, 8 -- even though they are very expensive to buy that way. The best Coca-Cola I've had lately is from an independent bottler in Winona, MN who offers Coke in RETURNABLE glass bottles. http://www.glassbottlesoda.org/bottlers/cokewinona.shtml
Cans are my second choice. Plastic bottles are a distant third, with the liter or larger plastic bottles being the ones I like least. I'll only buy them during "Kosher Coke" season, and then only if cans aren't available. The silliest thing I think Coke came up with was aluminum bottles
. Tried it once, when it was on sale at the student union here. Won't bother with it again -- even if they are still making them, which I'm not sure they are.