They do have scholarships for OOS students, including transfers, something like $8,000 a year, and OOS turion is $21,000 or so a year. If it would be affordable with the scholarship, I think that it would be worthwhile to apply.
Both are the same, it depends on which you feel is a better fit - look at the courses and the professors at each. Whatever career you choose, you really should engage in research or field work with faculty, so it is worthwhile choosing a program which has more faculty who do stuff that you find interesting.
You should also look at University of New Mexico - you’d be eligible for their Amigo scholarship, which is $22,000 a year, while the OOS tuition is around $25,000 a year. They have a good Ecology program as well.