Just based on what you've seen on the field this year. No preconceived notions from recent seasons, recruit rankings, assumed 2019 schedule difficulty, what individual players had done in the past, etc.
I'd go:
1. Ohio State
2. Auburn
3. LSU
4. Oklahoma
5. Georgia
6. Alabama
7. Wisconsin
8. Clemson
9. Penn State
10. Oregon
I'd go:
1. Ohio State
2. Auburn
3. LSU
4. Oklahoma
5. Georgia
6. Alabama
7. Wisconsin
8. Clemson
9. Penn State
10. Oregon