I have used varying forms of creatine in the past - mono, micronized mono, CEE, with sugar, without sugar, etc.
I'll make a quick subjective account...
creatine mono (w/out sugar) - Gave me the sh!ts 75% of the time, usually within 15 min. of ingestion. Good strength gains, didn't notice any extra sub-q bloat. Slight muscular fullness/softness.
creatine mono (w/ sugar) - Gave me the sh!ts 75% of the time, usually within 15 min. of ingestion. Really good strength gains. Very noticeable bloat, which seemed to be sub-q, not just extra muscle volume. Fat loss was hindered (taking 75g dex + 10g crea. mono. PWO).
creatine mono (micronized w/out sugar) - No sh!ts. No upset stomach or gas. Good strength gains. Fuller/smoother muscles. No sub-q bloat.
creatine ethyl-ester (caps) - I was taking some other stuff (like AAKG, etc.) when taking CEE, so I can only guess its direct effects. Good strength gains. No bloat in the muscles or sub-q. No gas, no upset stomach.
So, after doing all of that over the years, I've decided that 5-7g micronized creatine mono. in a no-carb PWO shake seems to be the best for me, overall. Right now, I'm cutting, so I try to keep carbs out of my shakes (I know the varying thoughts on PWO carbs). When I get back to bulking, I will ad some carbs - dex + malto + WPI + creatine mono micronized.