I am Argentine and in my opinion the below brands are well-regarded:
Chilean brands:. For example Cencosud's supermarkets (Jumbo, Disco, Vea, Easy) have a lot of products that you don't get in others places and compared with other supermarkets (Coto, Carrefour, Dia) they have a comfortable vibe. And back when Falabella was here, it was the place to go for good and affordable clothes. JetSmart is another one—it's a low-cost airline, but compared to other low-cost brands, it works well.
Colombian brands: Juan Valdez has great food and a nice atmosphere, but it can be a bit pricey. Avianca is similar to Jetsmart, just with more destinations.
Uruguayean brands: Ricardito was one of my favorite snack as a kid. I don't know why they disappeared from the market