It's hard to compare the two because I have modified the Nkryption Code a great deal.
The drill pattern on the N-Code, for starters, is a pattern that pretty much forces you to be more direct in the front part of the lane. Then, I polished that ball up to a high shine in order to work in the drier environment I am accustomed to.
And, my S75 has a fairly unique drill pattern on it, too -- pin on the VAL 4 inches above the PAP, MB at 9 o'clock to grip center out in the middle of the track, plus a light coat of polish over the factory surface.
Nonetheless, here's what I can say: The S75 can handle a lot of oil. It is very versatile, however, and can play down into the medium range before you have to bag it. Carry is just unbelievable. It may be the best ball I've ever thrown.
The N-Code, the way I have it set up, is ideal for mediums. Polishing that cover makes it act like a strong pearl. Great move off the spot, heavy drive through the pins, great carry. Aside from the carry, it's a very out-what-you-put-in kind of ball. It will help you cover up some mistakes but mostly its strong point is that if you throw a good shot, you get rewarded accordingly (and that's not necessarily true of all balls).
Both balls are some of the best lookers you'll see, too.
You could drill a S75, N-Code, Code (or for me, a Heist Pearl) and Link and have a four-ball arsenal that could play anywhere.
Jess