hi chiks
I did AOS in Aug'01 because i did not see any major time savings doing CP at that time and also i was not prepared to go to my home country for interview, medical, etc. In addition to that, i felt it more comfortable to go with AOS, since i can get the EAD, AP. As you might be aware, EAD is really helpful in this tough job market, especially if you are in consulting and if you are not sure about the duration of your project. My AOS case took almost 11+ months for approval, but it is very hard to predict how long it is going to take in your case. If I had to take a guess, it will be anywhere between 9 to 12 months waiting on an average, depending upon various factors.
Hope someone posts the current processing time for CP, which i am not familiar with.
RR