Stargate SG-1 isn’t better than the original film. They’re equally flawed in almost diametrically opposite ways. That’s not to say they aren’t good in their own way or watchable, 'cause they are.
Since rewatching the 1st season and most of the 2nd of SG-1, I’m inclined to say the film is actually better than the series, if only marginally. The production values, the writing, the abhorrent lack of continuity with the film, and the depiction of the US military as this benign/honourable force with only a few bad apples incessantly gets under my skin.