|Bamboo is trimmer because it holds more liquid than the same weighted cotton. So the bamboo ones are thinner with the same absorbency.
Bamboo is softer.
But bamboo goes thru alot of processing to become fabric, so it's not as natural as one might hope for.
Bamboo takes about twice as long to dry vs cotton.
There is some issue as to whether or not bamboo holds up as well as cotton over the long run(multiple kids, long term use, smaller rotation, etc).
Some people think bamboo also holds stains. I have all bamboo dipes & liners and I haven't found that to be the case, but mine are still the natural yellow color so it might be just a contrast deal.
Now, personally I love Bamboo Sandy's. We have all 20 of our Large Sandy's, 5 toddle-ease, and 15 liners all in bamboo. But that being said, even though I have washed them with ultra careful kid gloves(only vinegar, soapnuts, and washing soda since day 1), my daily use Sandy's are balding in areas by the waist and now, legs. Erika at Mother-ease said they are looking into whether long term friction in certain areas(waist, legs, etc) is wearing away the terry. She said cotton gets stronger when wet but bamboo gets weaker. I've had my Sandy's for almost 11 months now.
So if I could do it all over again, I'd pick cotton for it's worry free use long term. But bamboo is a lovely material and many other mamas use bamboo with no issues. ME has sold lots and lots of bamboo dipes and I am in the minority with issues.
If I wasn't having problems, I'd totally choose bamboo in a heartbeat! It is very nice.