I'm not sure if my old ears could tell the difference, but it may be nice to have the option. Lugia could probably break down the science of it for you, but changes in volume sound unnatural with linear VCAs if I remember correctly. Here's some additional info:
https://learningmodular.com/linear-versus-exponential/
Start off with the linear VCAs, and if you decide you need exponential, that's what you'll end up buying next. The beauty of modular! :)
Have fun.