alt Hacker NewsI don't think hotspots can be said to have different composition. But if the hotspot is under a continent or an ocean plate makes a difference for the type of eruptions. Hawaii is in the middle of an ocean plate, no continental crust there. So we get a basaltic eruption (comparatively lower silica content, low viscosity lava).
Yellowstone is also caused by hotspot volcanism. The friendly eruption is a property of location, not hotspot origin.
Your initial post read the other way, which the parent post is addressing.