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My golf place has both on sale for 24.00 a dozen.

which I think is pretty cheap. I want a softer cover ball, like the pro-v1 and I think the platinum is the one, but not sure really..
Whats the difference between the two?

Is the Platinum softer than the black?

I am gonna buy 3 or 4 dozen at this price.

From the ball test in the latest Golf Magazine:

The Nike One Platinum was about 10 yards shorter than any other ball they robot tested. The above was Nike's response to why the Platinum "came up short". If it was me, I'd go with the Black, but I need the extra distance. If you have swing characteristics similar to the above quote, go with the Platinum...and get off the computer and onto the PGA Tour

If you don'thave the magazine, here's the link to the distance test I'm referring to.
Flying High and Far | Equipment | Golf.com

Hmmm... Interesting.. I think the P is softer than the Black though.. That's for sure. How much, who knows.

From someone that has used both extensively, I like each of them.
If you need more spin, and aren't concerned with a little lost distance, go with the Platinum. It's a 4 piece ball, and spins like you wouldn't believe.
The Black is a 3 piece ball, and is very controllable. If conditions are soft, I'd go with these.
I actually prefer the Ignite. Good distance, control, and "spinability" all in a ball that's $10-$15/dozen cheaper than either Nike One ball. The cover is the limiting factor with the Ignite though, so be aware that it abrades more easily than either of the Ones.

I tested both ball side by side for 18 holes. For me, I was hitting the balls the exact same distance on average over 14 drives. The Black has a lower ball flight with my irons, and the Black spins less for me. If you want more spin to hold greens go with the Platinum. I like the Platinum for the added spin around the greens.

Thanks guys, thanks oneputt

In my personal tests i found for me that the platinum was longer and straighter then the pro v1. Between the black and platinum i go with platinum but thats just me. On nikegolf.com they have a simple 3 question test that tells you which ball they think you should hit.

Does anyone know if Mickleson was playing the new Tour i ball this week. He sure was spinning the ball back a bunch. He spun one ball back a good 40 feet. I wish I could do that.

He spun one back 40 ft out of the rough! WOW!