Have one day in Houston coming up, would you recommend the HNSM or the Houston Zoo?

Hi everyone! We're driving into Houston Friday morning for a concert that night and have time for one activity while we're there. We've narrowed it down to the Houston Science Museum and the Zoo and were wondering if anyone had any opinions on the better attraction? We'd also appreciate any bbq recommendations for around that area if anyone has one. Thanks so much!

Edit: Thanks everyone, looks like we'll be doing the Zoo and eating at Pit Room. Really looking forward to some great brisket