1. இனிய பொங்கல் நல்வாழ்த்துகள் (Iniya Pongal Nalvaazththukal): This is the more formal and polite way to wish someone a happy Pongal. It literally translates to "Happy Pongal best wishes."
2. பொங்கல் வாழ்த்துகள் (Pongal Vaazththukal): This is a shorter and more casual way to say "Happy Pongal." It literally translates to "Pongal wishes."
Both are perfectly acceptable and widely used. You can choose whichever one you feel most comfortable with.