The country that will possibly have more visa-free nations is expected to be
・Smaller country
・Smarter country
・Less threating country
So, I think that Catalonia, if it gets independence, will rank in better position.
Though those who support independence of Catalonia wouldn't notice it, more countries will offer visa-free service to Catalans than to Spain.
But, what I'm concerned with is that every area around the globe will strengthen independence movement after seeing Catalans' success, if they succeed to be independent from Spain.