When it comes to impersonating Sarah Palin, who does it best: Julianne Moore or Tina Fey?

Moore portrays the polarizing former Alaska governor and 2004 vice presidential candidate in the HBO film Game Change, airing Saturday.

Although the move has yet to be released, we have some clues as to Moore's performance through HBO's trailer for Game Change, which also stars Ed Harris as 2004 Republican presidential nominee John McCain and Woody Harrelson as McCain campaign strategist Steve Schmidt.

Based on the trailer, Moore plays Palin as a bumbling politico unprepared for the big stage of presidential politics.

Palin's missteps and gaffes during the 2004 campaign, including her claim that she could see Russia from her house and her disastrous interview with Katie Couric, were among the most memorable moments of the race.

Fey has earned widespread acclaim for her Saturday Night Live portrayals of Palin.

As Twitter users anticipate the release of Game Change, they have sparked a debate as to who best captures the essence of Palin.

Julianne Moore is good. But I am still reminded of Tina Fey, wrote user @FontanillaJr.

Twitter user @mattkoz81 agrees.

Also, I think Julianne Moore is playing Tina Fey playing Sarah Palin in the movie. Looks wacky, he wrote.

Julianne Moore was good but I think I still prefer Tina Fey's Sarah Palin, tweeted @mshikuma.

But not everyone in the Twitterverse thinks Fey's impersonation is superior.

Julianne Moore does the best Tina Fey, opined usedr @Jason23Nash.

Yall should just give Julianne Moore her Emmy now. Her Sarah Palin >>>> Tina Fey's Sarah Palin, tweeted Hustle Werxslaven.

Palin's political action committee, SarahPAC, is slamming the HBO film as inaccurate, going so far as to produce their own movie trailer that paints Palin is a positive light.

The film is adapted from the bestselling book of the same name about the 2004 presidential race, although HBO's version focuses more on then-Republican presidential candidate John McCain's selection of Palin as his running mate.

While there had been a groundswell of support for Palin to enter the 2012 Republican presidential primary race, she declined.

Palin is now a commentator for Fox News.

Who do you think does a better Palin? Watch clips of Julianne Moore and Tina Fey and put your opinion in the comments section below.

Julianne Moore:

Tina Fey:

Now here's Palin doing Palin in SarahPAC's trailer: