Atoms have a non-zero rest mass, which is interesting when, for example, we want to detect gravitational waves.
Atoms, as opposed to neutrons or electrons, are less susceptible to stray fields, but cannot be manipulated as easily as charged particles.
Atoms have variable velocities, and as a result, one can in principle, control their de Broglie wavelengths.
Atoms are easy and cheap to produce, as compared, for instance, to neutrons.
A very important aspect of the atom optics, is that atoms have internal structure, whcih can be probed and modified using light.
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