I like all of them, but I really like Samantha Carter.
Samantha "Sam" Carter is an astrophysicist and USAF officer. She is played by Amanda Tapping in a regular role in seasons 1–10, in both direct-to-DVD films and makes an appearance in all seasons of Stargate Atlantis. Captain Carter joins SG-1 under the command of Col. O'Neill in season 1. Following her promotion to Major in season 3, she is promoted to Lieutenant-Colonel in early season 8 and assumes command of SG-1. She assists Lt. Col. Cameron Mitchell in seasons 9 and 10. After her appearance in Stargate: The Ark of Truth, she is promoted to a "full bird" Colonel and becomes the new commander of the Atlantis expedition in season 4 of Stargate Atlantis before joining SG-1 again for Stargate: Continuum. She is later made the commander of the USS George Hammond, a Daedalus-class Earth ship named after former SGC commander General Hammond, who died in correlation with the actor who played him, Don S. Davis.
Who do you like best?
Jack. Because he's Jack and he's a huge smart-ass.
I named my youngest son Jack (he's 14 months old now). And my husband knows exactly where I got the name and why I picked it.