Interconnects priority

Greetings!

I am mulling over my interconnects and one question I have is, which interconnect is the most  important, if any, in the chain.

My setup is a Rega P8 with a Hana SL LOMC cart, into a Moon 310 LP / 320S phono stage, onto a PrimaLuna EVO 400 preamp and finally into a McIntosh MC312 power amp.

I am contemplating which interconnect (using XLR in my case) is the most critical to the sound/signal path, the one from the phono stage to the preamp or from the preamp to the power amp?

Or, looking it from another practical budget perspective, if I have a total of of $1,000 to spend is it clear that I should spend $500 on each XLR pair, or should I “overweight” my spend on one set because it’s the more “important” interconnect from a sound quality perspective.

(Of course assuming the interconnects are of equal length so that’s not a factor.)

Would love to hear this knowledgeable group’s thoughts on this - thanks!