In appraisal meeting they will speak only about your weakness, errors and failures.
In resignation meeting they will speak only about your strengths, past achievements and success .
In appraisal you may need to cry and beg for even 10% hike.
In resignation you can easily demand (or get even without asking) more than 50-60% hike.
During appraisal, they will deny promotion saying you didn’t meet the expectation, you don’t have leadership qualities, and you had several drawbacks in our objective/goal.
During resignation , they will say you are the core member of team; you are the vision of the company how can you go, you have to take the project in shoulder and lead your juniors to success.
There is 90% chance for not getting any significant incentives after appraisal.
There is 90% chance of getting immediate hike after you put the resignation.
So If you want an appraisal submit your resignation immediately !