Linked from
The 9 pages that link to OR gate, each with the reason it gives.
AND gateCompared with: Unlike an AND gate, an OR gate accepts any true input as sufficient.
NOT gateCompared with: OR combines inputs rather than reversing one input.
NOR gateCompared with: NOR gives the opposite output of OR for every input combination.
XNOR gateCompared with: OR responds to any high input rather than agreement between inputs.