Note that if you attend Washington as an undeclared student (not as a direct admit to the CS major), competition to enter the CS major is very high ( http://data.engr.washington.edu/pls/portal30/STUDENT_APPL.RPT_APPLICANT_STATISTICS_YEAR.SHOW_PARMS indicates that average college GPA of students admitted to the CS major is around 3.7, though admission is not strictly by GPA). Many other majors at Washington are also competitive admission, according to https://www.washington.edu/uaa/advising/academic-planning/majors-and-minors/list-of-undergraduate-majors/ – for some reason, many departments at Washington do not have sufficient capacity for all interested students, more so than at many other public universities.
Really, you should be very happy to have a good in-state option like Michigan where so many out-of-state students are willing to pay a much higher price to attend. Washington, unless you get both direct admission to the CS major and scholarships to bring the cost down to a reasonable amount, does not seem like a good option if you are also admitted to Michigan.