Case can be made that giving to disaster relief and other kind of emergent giving is much less effective, than consistent giving to well-established and proven causes.
Sources
Emergency health interventions are more costly and less effective than time-tested health activities. Improvisation and rush inevitably come with a high price. The preferential use of expatriate health professionals; the emergency procurement and airlifting of food, water, and supplies that often are available locally or that remain in storage for long periods of time; and the tendency to adopt dramatic measures contribute to making disaster relief one of the least cost-effective health activities.