What is the best strategy for you?
Leave it there-You may leave your account with the company after you leave. You may be happy with the selection of funds available to you. These funds are picked by professionals. There may be lower fees associated. If you leave your job 55 or older, you can withdraw funds from your 401(k) without the early-withdrawal 10% penalty. You will still have to pay taxes. If it is $5000 or less, the company may convert this into a money market account which earns low interest and has high fees.
Roll it over-You will no longer receive any matching funds. There may be high fees associated with the account. You may not be able to find your 401(k) because the company filed bankruptcy, changed names, was sold, changed administrator. You might roll it over into your new company. You have more flexibility in accessing your funds after 59 ½ . You have control of your money!