Both oil and agriculture are essential to a strong economy and both are equally important but if we talk about more economic growth then oil plays a vital role. Oil is the largest source of the country's total energy supply. No matter what is going on throughout the world but oil is always on demand replacing oil is almost impossible. Replacing oil is far away, for meanwhile there are no alternatives of oil. A country where, there are no any other income source but oil is there they are on the top most richest county for example we can see the example of United States, Saudi Arabia etc
Yes, I agree with you, indeed oil is a consumption that cannot be avoided by all countries, and is the largest source of income for oil producing countries. The agricultural sector also has a big influence on the population of the country. If a country like you mentioned is Saudi Arabia, it is quite a barren country, but there are many new advanced technologies nowadays in producing or producing agricultural products such as fruit and wheat.