Because this disaster was not due to terrorism, occurred in Texas, and happened at a fertilizer plant instead of a sporting event, the Boston bombings are clearly more universally interesting. Still, the explosion in Texas is a far larger disaster. At least 13 are dead, hundreds are injured, and over a hundred buildings are destroyed. And the explosion emitted toxic chemicals that will kill more people in the area or shorten their lives considerably.
Texas Fertilizer Plant Explosion Killed 13, Injured 200 - ABC News