This could be investigated technically, but it seems people are more inclined to the assessment of their ear.
Properly understood, all the loading really does is adjust the frequency response of the TT output, particularly in the high frequency range above 10kHz. Setting the load resistance too high will cause a spike in high frequencies right before the 20kHz roll off. This will create a shrill sound. Setting too low will cause a gradual roll off at about 8-10kHz, which will sound muddy or muffled.
Starting at 100ohms for the Denon means going up to 470ohms will have a very small effect, if at all. Going up to 47k ohms will have a major effect, as well as going down too far like 10 ohms.
The Nelion phono board has a 150ohm setting, so that should suffice very well. At the very least a great starting point.
Moreover, we shouldn't forget that most pre amp's have tone controls, and if ever there was a good use for them, TT cartridges would qualify exceedingly. So if some strange (or superstitious) reason one doesn't feel comfortable with the loading scheme, the very same effect of dialing the loading can be made much easier, and perhaps more satisfying to certainty, with the tone controls.