If your new 401k offers good fees/funds, see if you can roll old 401k directly into new 401k.
You don't want a Traditional IRA if you plan to ever do back door roth (pro rata rule) when your income is too high for tIRA deductibility. Paying taxes to go from your 401k to Roth IRA could make sense if you're in a low income bracket now, but we'd need more info like others have said.
Basically need the info on your current funds and fees in your existing 401k account, whether you can leave it parked there until your new one is active (this usually depends on balance and/or length of service, check with the custodian [the bank/broker/servicer]), and your current marginal tax bracket when you file taxes.
If you don't know that last part, approximate income, filing status, and whether you itemize or take standard deduction. Please give us a fuller picture of your financial situation for more personalized advice.