I think the question has been aptly answered..
The answer comes to my mind, came from a quote made by an old WWII fighter pilot, describing why he liked his P47 instead of that new hot P51 Mustang..

(Living in CT).. It's like being with your girlfriend. You know the good points & bad points. You learn to live with the bad, and use the good to best advantage.

Another old adage that fits goes like this:

"The devil ya' know, is better than the devil ya' don't"