I'm assuming the OP means Roth IRAs, and not Roth 401k, since you would not be able to withdraw from a 401k while employed.
If you are not currently contributing to IRAs, definitely add those vs savings accounts doing nothing.
I'm planning on reserving Roth IRA contributions for a Roth conversion ladder when we FIRE, as we have little in taxable accounts.
Under current FAFSA rules, any withdrawals from a Roth IRA are added to current AGI when calculating your EFC, increasing your EFC. So withdrawals would be counterproductive until after Jan 1 of the student's sophomore year. Rules change, though - things are much different for my DS4 this year vs DD1 in 2008, and I'm tracking changes for DS5 who will begin college in 2023.
We've chosen to maximize our retirement contributions to a variety of accounts (HSA, trad, Roth) to hedge our bets, and do our best to maximize financial aid of all types: state/fed/institutional grants and scholarships, academic scholarships, loans, work study, student income, tax credits. Sometimes good for one is bad for another, so we weigh the differences each year. As college is immediate, and retirement is future, we tend to favor advantages for college now, and defer retirement options that become too costly when college aid is at stake (like Roth conversions).