To be or not to be

[Sweng]

Hi All,

Could you please let me know if it is sometimes OK to use redundant words in a sentence? For e.g.

To become a doctor or not is a decision to be taken early - normally used
To become or not to become a doctor is upto you to decide - doubtful

To buy or not to buy this property/car is something I unable to take a decision on - doubtful
To buy this property/car or not is a tough decision - normal I guess

To be or not to be a buyer of this car - doubtful

Any help would be greatly appreciated.