When I compare data from the same (my own) profile, the same data range at analytics.twitter.com and at socialinsider, they shows different numbers. And I mean the very basic stuff: retweets and likes.
Socialinsider: 38 RTs, 13 likes
Twitter Analytics: 15 RTs, 50 likes
Why? How’s that possible?
To be honest, Twitter Analytics is what I believe in more. It’s closer to the source and delivers some extra useful data, like link clicks and replies.