It is. I find Big 5/OCEAN to be both more scientifically validated and more intuitive to use, as all Big 5 traits exist on a spectrum. It's much easier to understand what it means when someone says they're in the 25th percentile for extraversion (that is, 75% of people are more extraverted than you), and tease out what implications that trait has, than for them to say, "I'm an INTJ" and you need to know not only those 4 traits, but the "cognitive functions" beneath them and how they interact with each other.