I have a slightly different question.
Imaging someone at Intel with Grade 5 having the same salary as Grade 6.
So, which one is better the one who is on Grade 5 while still getting paid same as Grade 6 or the one with Grade 6?
Same applies for other companies as well.
Also, your question makes no sense. For the same pay, of course you want to be at the higher level assuming you can do the work.