What gave you the best result Countdown Timer or Limited Stock Bar?

You use only these kinda apps in Cyber Monday, Black Friday kinda Shopping festivals

Neither it's spammy and people hate it. Just build trust with reviews and high-quality branding

Neither! You can express urgency in your copy, the color/movement of your buttons, or even how your website is designed around it. Those methods have been overused already more than 5 years ago. Consumers are already trained subconsciously to think you're a fraudulent shop when you have these due to bad experiences in the past.