What charger is best suitable for iphone 12 12 watt or 20 watt please tell me i want to purchase

Either will work but the 20W is physically smaller, will work with the USB-C cable that comes with the iPhone 12, and also has fast charge capability.

Hello tarunsharmag,

FoxFifth is correct the 20W is best. The "battery health" thing is a myth. See this:

When to charge your iPhone or iPad

Good luck.

Some people are frequently wrong. Most people use the 20W adapter for recent iPhone models.