I think the White Sox are probably the best team the Astros will have faced in the post-season. They had the best pitching staff in baseball and a well-above average hitting lineup, with their only real flaw being their fielding. I'm still surprised we blew up their starters in each game of that series.
The Braves are good at a lot of things but aren't really elite at anything. I think Riley, Freeman, and Soler are good hitters, but after that the lineup fades pretty quickly. Rosario and Pederson have been hot but both are generally average hitters.
With that being said, I think this series will probably come down to which versions of Valdez, Garcia, and Javier the Astros get in this series. Those three guys turned the ALCS around and shut a red hot Red Sox offense down. If they play like they did in games 4-6 of the ALCS then I think the Astros win fairly comfortably, if not then this series could go either way.