I can not think anything good done by the Bourbonical monarchy in Spain. That French family in 3 centuries have nothing of note at all.

Habsbourgs built the first global power ever, explored and mapped the world and launched a massive campaign of cultural, religious and political influence that cast the shadow of the family from China and Japan to the English Parliament itself. Franco started to restore much of the influence lost in America during the Bourbon era, transforming Spain from a rural and backward country into the eighth largest industrial power in the world.

What have the Bourbons ever done in 300 years by comparassion?

Philip V auctioned Gibraltar, Menorca, Sicily, Naples, Sardinia, Belgium to usurp Spanish throne backed by his grandfather Louis XIV. And later on Charles IV and Ferdinand VI auctioned and tried to auction Florida, Louisiana, the Iberian peninsula itself and Hispaniola to Napoleon and USA. Then auctioned Cuba, Puerto Rico, Guam and Filipinas to US in order the get British support for their own regime, and finally auctioned the Sahara to Morocco when Franco passed away to get US support to their family in the transition.

Why Spaniards aren't radical fallangist republicans at this point, or if they are just that fans of having Medieval institutions, just seek another more honorable family to take the charge? Because even the titles of Spanish monarchy (Kings of Jerusalem, Roman emperors, Kings of the Americas, etc.) don't even come from the Bourbons but from the Trastamaras and Habsbourgs.