# Which gate set should be used when I measure the depth of a circuit?

I want to measure the depth of a circuit, but I do not know which quantum gates should be used when the circuit is decomposed. For example, $$ZZ$$ rotation (i.e. $$e^{i\theta \sigma_z^i\sigma_z^{i+1}}$$) can be decomposed as $$\text{CNOT}\,R_z(\theta)\,\text{CNOT}$$. So, I think the depth of $$ZZ$$ rotation is 3. However, if $$ZZ$$ rotation gate exists, then the depth should be 1.

My question is as follows: Which gate set should be used when I measure the depth of a circuit?