As the 'R' model, the OnePlus 12R has some drawbacks when it comes to hardware and camera capabilities that allow it to get its cheaper price tag. So, to answer the question, the OnePlus 12 is better than the OnePlus 12R on paper, but that doesn't necessarily mean that it's better value for money.
Realistically, the choice between the OnePlus 12 and the OnePlus 12R depends on your specific needs and budget. If you prioritize performance, advanced camera capabilities, and the latest technology, the OnePlus 12 is the ideal choice. However, if you're looking for a more budget-friendly option with a larger battery and good overall performance, the OnePlus 12R makes for a solid option that's making its mark on the budget Android phone market.