Difference between different brands of same oil
In practice, the major refined oils are commodity products, and the two different brands may even come from the same factory, but with different labels applied.

Still, it is possible that they are from different producers, and have a different quality standard of refining applied; one may be more aromatic than the other (which is a defect in a refined neutral oil).

The only way to know for sure is to try the less expensive brand.  If it has no off-putting aroma, you have a good value.