Question:
Which....cK one or CK be, do you like better? and why? or what would you substitute either with?

Answer:
cK be.
It was maybe the first scent I got once I got past cheap drugstore crap and Drakkar Noir. The first fragrance I bought when I had my first girlfriend, so it will always remind me of a beautiful time.
cK one is nice. I wasn't on board really, when it came out. The funny thing was that I bought a cheap knockoff at Sam Goodys once called "Melrose Place", which was a product tie-in from the TV show. I wish I still had it, because it was really nice and even though it was kind of cheap, I got all sorts of compliments.
I recently retried cK one, and while it was nice, it's like a less spectacular version of Silver Mountain Water to me.
It seemed like all the cool kids ran out an bought cK one. All the more introverted, quirkier types went with cK Be.

Answer:
I'll second cK Be.
It's the perfect scent for when I just have no idea what to wear. It's low-key, extremely pleasant, and very versatile. Though I don't wear it frequently, I couldn't imagine not having it as a "Plan B" when there's nothing else I feel like wearing.

Answer:
I like CK One better. Smells more cheerful. Probably the most cheerful scent ever

Answer:
I'm for ck be — a great scent, with a serious warmth and beauty to it. ck one is a nice, very fleeting, citrus: the first scent I ever experienced that really didn't last more than a half hour. ck be doesn't last very long either, but a little longer than ck one.

Answer:
ck be

Answer:
CK Be.

Answer:
Neither, I would use Allure Sport from Chanel instead of those 2.

Answer:
I love CK Be but honestly it's not worth buying if you want any sillage at all.

Answer:
Of the two, I prefer ck One... (comparable PERHAPS to L'eau d'Issey Pour Homme).
Its fresher than ck Be which lasts all of 90 seconds on my skin.