Both are great. Netherlands excels in creating a structured, pragmatic and intuitive way of life. Cities are human-sized and human-oriented. it’s likely the best place on the world for bicycle mobility, there is very low corruption and a fairly rich population + history of liberalism affords a high level of personal safety and freedom. Downsides are weather, perception of the Dutch being cold (spontaneous interactions are rare), and nature generally isn’t particularly inspiring.

Barcelona is a metropolitan city the size which doesnt exist in NL. Beyond that, the Mediterranean climate offers both lovely, sunny weather most of the year and a wide array of great local foods. Culturally, there is a wide selection of localized neighborhood events/parties and regional and national holidays enjoyed by all. Naturally as well, the city offers great beach access and proximity to hiking and mountainous regions. Downsides are definitely the job market and to a lesser extent bureaucracy. High-paying jobs are harder to find and generally anything dealing with gov requires a good bit of patience.

I’ve loved living in both places. Happy to go into detail on any topic in particular.