I have 3 - 4 years experience of using adobe analytics reporting tool and planning to take certification but I see there are 2 certification
AD0-E208 Adobe Analytics Business Practitioner Expert & AD0-E202 Adobe Analytics Business Practitioner Expert
As this is my first adobe analytics certification I don't know which one to select AD0-E208 or AD0-E202.
Also how much time can I take for exam preparation ? 2 - 3 months?
You should start with AD0-E202. Also, if you have 3-4 years hands-on experience with Adobe Analytics, you can revise for a week and appear for the exam. It's not difficult and anyone with practical understanding of the reports and familiar with the tool should be able to clear this.
I've only taken AD0-E202, as AD0-E208 is new. Unless they changed the AD0-E202 exam in the last year, a number of the questions were very in the weeds with how Adobe Analytics worked and the whole thing felt a bit dated. Reading through what someone should be familiar with in order to pass AD0-E208, the description sounds like the exam deals with the way that you'd interact with Adobe Analytics today rather than 5 years ago. I'd consider AD0-E208.