I'm using Twitter Tools to update my tweets from sidebar. But look like the Twitter widget only updates few twits n misses many. (in my case it updated 2 out of 5 yesterday n 1 out of 2 today).
I would love to send screenshot but option is not here.. but still u can visit http://blog.zeronea.com/
you may find difference as per my options, I've kept Twitter tools to show recent update while Twitter widget to show last 5 tweets.