Enroll in Cobra to maintain continuing coverage, and then roll your plan over to individual coverage. It's possible you will not even have to pay a cobra rate at all.
The main reason to do this, is if for some reason you can not get coverage otherwise, or you have a condition that has developed since your previous enrollment. For instance, you've had coverage at work for 5 years now. 2 years ago, you got diagnosed with cancer, and they are paying to treat it. If you have a gap in your policy, it will become a pre-existing condition on your new policy, and they will not have to cover it.
The purpose of COBRA, is to allow you to maintain coverage while either getting a personal policy (which is almost always cheaper, unless you are the reason the group rate was so high in the first place), or enrolling in a new group policy at your new place of employment.