It is generaly hard to compare classical and quantum computers, as both are based on different calculations paradigmas.
Besides number of qubits, it is also important to track inter-qubits connectivity, gates fidelities, relaxing and dephasing times etc. These measures do not have analog in a classical computer.
Also, it is hard to compare "clock speed" of classical and quantum processor. Quantum processor work in kHZ or low MHz range, while classical ones operate in GHz range. This is not a problem since power of quantum processors lie in lower complexity (not in all cases, of course!) of employed algorithms in comparison with classsical processors. So, you can for example take several problems (algorithms) and compare their complexities in classical and quantum cases, however, be aware of assumption under which the complexities are derived.
Concerning memory, there is an issue with quantum analog to RAM, so called qRAM. Currently such memory is not available (with some exceptions). Non-existence of qRAM somehow hinders theoretically reachable power of quantum computers. Once qRAM is available, qubits will be akin rather to registers in classical processors. So, comparison of qubits number and classical RAM size also says nothing.
If you wanted to make a comparison of classical and quantum computers development, I would advise to show how some crucial parameters evolved in time. In case of classical processor, number of transistors or clock speed would be appropriate. In case of quantum computers, relaxing and dephasing times, number of qubits or gates fidelities would be suitable. However, as with any other technology, you will see exponential imporovement in the parameters. A question is if this indicates something new. Simply any new technology evolves rapidly when some turning point is met.
It makes much sense to compare different technologies used for physical qubits implementation, e.g. trapped ions with superconducting qubits.