The only reason that caffeiene and creatine have a slight counteractive affect on each other is because they are both slightly basic nitrogenous carbon molecules.
The other way that caffeine hurts absorption is through filtration rates and overall blood perfusion. Caffiene is a vasconstrictor, with less room for blood flow you have less of a chance to use optimal amounts.
The reason I said go with the Caffeine-Free is so it doesnt counteract the beneficial affects of NO. The L-arginine gets broken into NO which is further broken into guananyl cyclase. The guananyl cyclase is broken into a more usable form by the activating enzyme cGMP. What all that does is cause smooth muscle relaxation around your arterioles, vasodialation, causing for a better blood flow or "pump", if you might say.
So in general, less caffeine = more efficient usage of the NO product = Better absorption of chemicals, macros and other supplements = bigger, better you.
The Kre-Alakalyn is just creatine mono and Soda Ash (sodium carbonate, Na+CO3-). It has buffering conjugate bases to counteract acidity. Since creatine is a basic molecule by nature, putting it an acid enviroment causes it to breakdown and denature in creatinine. However, all creatine eventually gets broken down into the by-product, but its at a less rate and not all at once.
All in all, I am not a fan of creatine, your body has to get rid of creatinine from your own sources (creatine phosphate used in anaerobic metabolism). They are now just starting to find studies of people with "pickled" livers and chronin kidney conditions.
For me, Ill just eat, sleep and lift.