If they are both 20 minutes away go to both and get the things you feel are a better deal. I don’t usually shop at 1 grocery store because some have better produce, while another may have better meat. I’m new to the area also and my wife works close to Stew’s. Starting to feel my way around I do like how they have parts of meals prepped for you. Example being just chopped veggies for soup or pre marinated chicken wings. Helps save some prep time but I still cook it the way I like it. Where I lived before I would go to Trader Joe’s about twice a month because I liked there ice cream treats, frozen dumplings, and it had a great liquor section with there own brand liquors that where on par with decent to top name brands. No need to limit yourself to one.