Yeah, Fiesta Texas would be my choice too. It is closer and I had a much better time at Fiesta than Astro. I was just at all 3 (and Jazzland too) less than a month ago. Astroworls has more coasters, but nothing really stands out, except Thriller (Tex Tornado) but it is almost never open.
Besides, Fiesta has a Sky Scraper, YOWSA!!!
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"X" marks the spot in 2001!