That really depends upon your specific situation. You can read articles like this one (http://www.smartmoney.com/personal-finance/retirement/which-ira-is-best-7968/) and try to decide which course is best for your situation.
A 401k and a IRA are different. A 401k is a employer sponsored plan while a IRA is not.
Yes, you can rollover your 401k to an IRA.
Yes, you can rollover your 401k to an IRA.
Yes, you can roll over your 401k to an IRA.
Yes, you can rollover your 401k to a traditional IRA.
Yes, you can rollover your 401k to an existing IRA.
No, you cannot roll a Roth IRA into a 401k.
Yes, you can roll over your 401k to an IRA.
There is one main difference between a 401k and a Roth IRA. The maximum contribution limit for a 401k is about three times that of an IRA.
Yes, you can move your 401k to an IRA through a process called a rollover.
To avoid any penalties you should roll your 401k into an IRA account.
The best option usually is to do a direct roll-over from the 401k to an IRA. You can get forms from your 401k company or the new financial institution where you want to put your money. If you do not already have an IRA, the 401k company can help you set up an account.