75k Cash: Pay off student loans or use for a mortgage downpayment

[Arthur Means]

Hey all,

New here.  I am hoping some of you can help provide clarity to my situation.  

I currently own two homes.  One is a rental with about 40K in equity.  The other is our residence with 75K equity.  I am in my early 30s.  My wife has about 75K in student debt.  My question is simple...  If we sell our primary house, is it better to pay off the student debt or put a nice downpayment on the next house?

I have been leaning towards paying off the student debt, primarily for tax purposes.  The student debt only lets me write off a very small amount of interest but the house would let me write off basically all interest.  Also, paying the student debt would free up about 500-600 per month.

Now, there is a wrinkle here of course.  There is a possibility that about half of this debt could be forgiven after 10 years under PSLF.  But that is way up in the air with the new administration.

I welcome any insight.  Thank you all