Just try it and choose for yourself. You can find people that swear one is better than the other. Ultimately, it probably falls well down in the marginal gains spectrum.
There are considerations related to flywheel speed, with an aim to mimicking a feel more like you have outside. Beyond that, its probably splitting hairs.
Edit to add some links the existing discussions on this topic:
-
ERG Mode or Not on Workouts
- The topic above also has a great post with links to several discussions:
- ERG Mode or Not on Workouts - #5 by onemanpeloton
General “ERG Mode” search results:
General “Resistance Mode” search results: