Difference between Gene replacement therapy and Corrective gene therapy

Difference between 

Gene replacement therapy vs Corrective gene therapy

No	Gene replacement therapy (Gene augmentation)	Corrective gene therapy
1	Addition of healthy gene without replacing defective gene	Addition of healthy gene replacing defective gene.
2	Suitable for recessive disorders	Possible for dominant disorders.
3	Non-specific insertion and no recombination event	Site specific insertion and recombination event should occur.
4	Approach is not useful when the defective gene produces a disease causing protein	Approach is useful when the defective gene produces a disease causing protein or an interfering substances.
5	The approach is more feasible	Extensive study is required.