Q. Which variant is good in automatic petrol?

Selecting the best variant would depend on your budget and the requirement of features. If you are on a limited budget then you may opt for the Nexon XMA AMT variant, whereas if the budget is not a constraint, then you may go with the Nexon XZA Plus (O) AMT or the dual-tone paint option. You may check out the variant-wise comparison, here: Nexon XMA AMT S vs Nexon XZA Plus (O) AMT.

Value for money is XMA variant but if you want car with fully loaded features go for XZAplus

No idea