Any hardwood used on this or any of the bar projects is intended as trim, which will be visible as a final wood layer. In this case, I’m assuming these are the squared arm rest and foot rest boards. If you have the cash, use Oak, but if it is too pricey or want a rustic bar, go with select pine.
If you REALLY want to make it look nice, any bar top can be modified for Chicago style arm rail molding. EHBP-09 is a good plan to study for that technique. Bar rail molding can be found here > https://www.barplan.com/store/molding.html
There are countless ways to do this and a visit to the gallery might give you more ideas before you decide which way to go. The plans are NOT written in stone.