It would depend on the tone arm, what it was wired with, and how strongly you wanted a particular wire used.
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Without knowing your particular situation, it is hard to say if it is worthwhile. But be careful what you are doing. Changing arm wire is a one way street. If you don't like the result, it is very difficult to change back. So unless you have an old arm or you know the arm wire has degraded, you might want to find someone who has the wire changed and listen to the result first. Quite often in audio, different isn't always better, and change doesn't always mean upgrade.
I think you might find that the best benefits come when you rewire an arm from its bayonet or the cartridge leads and go straight back to the RCA phono inputs in a continuous run.
I really like using Cardas 33 awg in my arm rewire projects where solid state amplification is performed.
The A-M Systems solid silver core wire in teflon coating sounds even better but I prefer this in tube driven applications.