I've also read Solo Leveling and I think it is fantastic! However, you shouldn't compare the two series. They are very different (in terms of plot, power of the MC, personality of the MC, and story line), so you cannot say one is better than the other.
better is subjective
I'd say it's interesting in a different way. Solo has one person mainly while this MC has very blatant allies helping him in everything
Solo leveling is legendary while this one is also legendary that's remind of our ex legendary mother slipper expert
I recently picked this up and loved it, but then I came across Solo Leveling and if you havent read it yet, pick it up. U wont regreat it, its better!