Red_Vespa saidYeah, totally subjective, but my own experience in both cities tells me that Houston has more gay places and is more accepting. Not that anywhere in Texas is terribly gay friendly, but I give Houston the nod.
Having lived in Houston for nearly two years, now, I can tell you that the gay community here is alive and well. I haven't lived in Dallas, but as compared to Austin, where I lived for eight years, Houston has a very distinct 'gayborhood', i.e., the Montrose District. While it's no Castro, it does offer many of the same amenities. Although I can't confirm it, I've heard that Houston has something like the third largest gay population in the US, but it's only the fourth largest city in the country. Kind of surprising, given that Houston was ground zero for the precedent-setting Lawrence v. Texas case that led to a Supreme Court ruling banning all US sodomy laws.
While many areas outside of the 'loop' are blighted, the central core is thriving and cosmopolitan. Rice and St. Thomas Universities are nearby, and the impressive downtown theater district is a stone's throw away. You'll find very few fast food joints in Montrose, but there is plenty of eclectic dining and quirky shopping. The bar scene is OK, and it's generally concentrated within a 4-6 block area -- great for bar hopping, or Mardi Gras-style street festivals.
Yes, the summer weather can be oppressive, but mornings and evenings are pleasant. Fall and spring are idyllic, and while the winters are generally mild, the winter rains can be chilly. We even got a couple inches of snow, last winter, but that's a pretty rare occurrence.