Free tuition is a waste of money for many. If you want to expand that to free trade schools, I believe you get a better result. I don't have to ask you the number of college grads who are not working in the field they studied.
Further, I don't have to tell you about the thousands of extremely intelligent graduates who have a 1% chance of landing a job in the field they got their degree in. My friend's son was 1 of 100 applicants for an engineering job at G.E a few years ago. He was part of the 1%, thankfully.
Edit to add
If you make that nickel/trade $.25, you can fund both.