I think, this will depend on your Phonosection, but normally: YES Better headroom, better detail, improved speed and timing, but when the Phono Section is not that great, try a High Output MC. Makes Life easier.
To find out for yourself, I'd recommend trying a Denon DL-103 (available for under $200) to see how an MC sounds in your system. You'll need a phonostage or step-up transformer capable of handling a low-output cartridge. God luck, Dave