Trending @Infosys; Should I resign??

I currently work at Infosys. My current CTC is around ₹15.5 LPA, and my promotion affective from Jan 1 will increase to around ₹18–18.5 LPA.

Recently, I received an offer from TCS. The recruiter initially told me that the fixed salary would be ₹19 LPA. No variable. They made the offer on my past CTC as I did not get current compensation revision letter.

Now I am trying to decide how to handle the situation.

My current thought process is to accept the TCS offer and then resign from Infosys, which would start my 3-month notice period. Since I have strong performance at Infosys, I believe there is a chance the company might attempt to retain me with a better offer or salary correction. If that happens, I would then have to decide whether to stay at Infosys with a retention offer or move to TCS with the package that was offered. Or take the offer letter and utilise it to get better offer in product-based companies as its hiring quarter.

So essentially, my situation is that I have: • A potential salary increase coming at Infosys through appraisal/promotion • An external offer from TCS with a higher overall package • A plan to possibly use the TCS offer to trigger a retention offer from Infosys during my notice period

I want to understand what would be the best way to approach this situation and what risks or considerations I should keep in mind before making a decision.