Assuming you qualify - I am a big fan of the Roth IRA. But in some cases rolling into another 401k makes more sense. If you think you might need access to some or all of the money before retirement age, the 401k may make the most sense as there are qualifying reasons you can make early withdrawals without penalty, which cannot be done with IRA's. The "buying power" of a 401k may be better for investment choices you have access to compared to going with self directed IRA access.
You weigh that versus the Roth advantages of paying a small tax at the 401k rollover; then having everything it and any future contributions make as a return growing tax free along with the distributions you begin taking at retirement age.
An example on the Roth. I am double your age. I rolled a 401k balance into an existing traditional IRA at retirement. As my income dropped below the max threshold, I converted it into a Roth and paid the federal taxes due on the combined accounts out of available liquidity, which is better than taking part of the investment and using it to pay the taxes since you lose some of the benefit. I was fortunate in that there was a period around 2010 and 2011 you could do this regardless of personal income limitations for conversion and could pay the taxes due over a two year period. That Roth has since doubled in value. No taxes will ever be due on it when I begin taking distributions. There is also an added advantage that if you die, your heir(s) will not have to pay any taxes on it either as long as it has been in existence for at least 5 years. There are no required minimum distributions (RWD's) with a Roth when you hit retirement age. You can take all, part or none based on personal circumstances.
Since it is a low balance, I would pick one of those two depending on your personal circumstances.