Load setting for Dynavector DX-20XL


I have a 20 XL that according to specs has load requirements of >30 ohms. I have just acquired a Jeff Rowland Continuum integrated with the built-in phono module. It has two MC setting, one for 100 ohms and other for 400 ohms. Which do you think would be better?

Thanks
stratguy
In order to change it, I need to take the amp apart and remove the phono board. I was hoping to avoid that.

Thanks for your input.
Probably 100, but with only two options doesn't it make sense just to try them both and listen?