Since the areas are so close together you should look at all options. What is "best" is extremely subjective and you and your family are the only votes that should ultimately count on that decision.
Compared to Santa Barbara, every city in Blaine County will seem small and quaint, but that is a lot of the appeal. When you are looking for at least an acre, the actual "city" may not really matter as much.
I think you would be doing yourself an injustice if you ruled out either city before visiting them and looking at the available homes.
Because of the limited inventory of homes in your price range and meeting your criteria in Blaine County, I have attached a link that might help you as you do your research before choosing on moving. I hope it helps!