What I can say is that there will be a difference with Monster Cables (or Zaolla solid silver conductor stuff etc etc), but the important thing is ALWAYS:
Do you actually need that difference?
There's talk on how the 'old skool' tone is also partly contributed from the kind of cables they use: the kind that loks like springy telephone wire. It makes the tone a bit duller, thus perceived to be a bit 'fatter'. Something like that. So going along he same lines, if you get a cable 'perfectly' constructed in a way that it eliminates all the factors that COLOUR the tone of your signal, then you will hear exactly how your bass sounds like without the cable interfering with your tone. Instead, you can add your own colour to your tone if you want to, not work around the sound that is already coloured to begin with, although I don't deny that you can. Its only doing a 'double job' kinda thing.
And there IS a difference in sound, for those who can hear it. Do blindfold tests with an open ear and an open heart.
So after all that blah blah, it always comes back down to: Do you NEED that difference? It won't make hell much of difference, but its still a difference... That's where people draw the line and get high-end cables. To each their own.
Me? I use handmade (by myself) Canare Japan L2T2S cable (2-core) with Neutrik Swiss NP2RCS right-angle plug (bass end) and NP2C straight plugs (amp/effects end). I did the wiring so called the 'directional' way, coz there's actually less noise that way... I have another exact same cable wired non-directional that I made to compare and it contributes more hum somehow in certain setups. I have another one I made using Canare Japan GS-6 (that's actually meant to be guitar cable) as well , with the same Neutrik connectors, but the L2T2S sounded better... Cleaner tone, the bottom is a bit more muddy with the GS-6. Why? I don't know.
And the best part: the cables I make for myself never cost me more than $25 each. And I trust my own soldering, so no worries at all. Reliable good stuff, no gimmicks for me. I've been using them for more than 5 years since I made them. Never any problems whatsoever. Sure beats lifetime warranty if you can repair them yourself and know how to take good care of them when coiling up etc.
Best advice: go and test out stuff for yourself. If you like what you hear and the price you have to fork out for high-end cables, then the choice is yours. Every company wants to sell their stuff. There is no 'right or wrong answer'