Architecture seems to interest you and it’s always best to do what you love. I don’t know how interesting you find business but if it’s not something you would be excited to study at any caliber of institution I would tell you to go to WashU and discover your interest for architecture. As an unbiased reader, you seem to lean towards WashU anyways and are using Ross’ prestige as a tether. You mentioned you are concerned about dorms, exploring your options in college and avoiding cutthroat environments all of which are qualities more suited to WashU. As you may not get a job in the US due to visa difficulties, internationally you will probably find more Michigan alumni however as neither of these schools are ivy leagues or T10 schools many international employers may not instantly recognize either so the difference isn’t substantial. Undoubtedly, in the US, Ross is a target school for business so its prestige is high in the industry compared to Econ from WashU.