I've tried both. Here are my thoughts:
CET:
-I noticed the full effects VERY quickly (~2 or 3 days) of starting the pills. -Strength gains we relatively consistent from that point forward.
-However, I had trouble getting quality sleep while taking the full dosage (ie, 8 pills).
-I noticed no difference when decreasing my dosage down to 6 pills. (I'm only ~165 lbs, so maybe that's why.) Unfortunately, I still couldn't sleep well.
-I noticed a loss in strength/endurance if I decreased my dosage to anything less than 6 pills.
CEE:
-I started off by taking 2g pre-workout, and 2g PWO.
-I did not really notice any improvements to my workouts until almost a week after starting the powder. Also, these "improvements" weren't all that subtsantial. Needless to say, I started to get little disappointed and pessimistic.
-Over time (~3 or 4 weeks), I decided to up my dosage for kicks.
-These days, I'm now taking ~3g pre-workout, and 2g PWO. Since upping the dosage, my strength gains have been HUGE!
-I'm currently the strongest I've been in my entire life.
-CEE doesn't seem to affect the quality of my sleep.
Other notes:
-I used to take creatine-mono many years ago, and it also worked very well for me, at first. However, it didn't seem to be effective after my 3rd or 4th "cycle" of it. (In other words, I didn't notice any strength gains.) So, I stopped using it.
-I first tried CET ~5 months ago, then stopped after ~6 or 7 weeks (because of sleep issues).
-I first tried CEE ~3 months ago. As of today, I haven't taken a break from it except for 1 week when I was out of town on vacation.
Summary:
I prefer CEE, hands down. Although BOTH versions are the most effective supplements I've EVER taken, I prefer CEE because it's cheaper, and it doesn't screw with my sleep.