Consolidate into Private Student Loans

I just received my financial aid for graduate student and it is about 90k. I have secured some scholarships and brought the balance down to 80k. I just applied to Sallie mae's student loan and was offered a rate of 4.2%. Both me and my co-signer have excellent credit scores. I have also accepted my FAFSA aid which is 20.5k at a rate of 7.94%. My question is, should I just consolidate my loans under private instead since it's a much lower interest rate? I don't see a benefit of having federal loan. For context, I will be making about 150k upon graduation and don't think income repayment plan is going to benefit me. I also don't think I will be paying for long enough to qualify for PSLF. This is my first time applying for student loans so bear with me. Thanks!