Music in Van Helsing is way better.
Voice acting and fun dialogue better in Van Helsing.

Grim Dawn is faster paced and more fluld in movement and fighting.
Grim Dawn has the better skill trees
Grim Dawn has more exciting loot game - more loot, constant comparisons.

Van Helsing loot is good, just a slower game.
I like Van Helsing's "Essence" system for improving weapons. Grim Dawn's constant crafting of gems and artifacts gets tiresome.

I enjoy Van Helsing's skirmishes into the Ink. More fun visually and spacially than Grim Dawn's portals to dark bony wastes.

Story is better in Van Helsing, but story doesn't matter too much in ARPGs.

Overall, I am enjoying each for its own strengths.

Fun!