(Obviously I leave aside the differing mechanics and leverages of different people and assume a person with generic body measurements)
In this sentence, you ask us to ignore the actual answer to the question. There is no such thing as "a person with generic body measurements". This question comes down to "how is your skeleton put together?". Some people are optimally put together for sumo deadlift - and these are the people that most often attract stupid comments about how sumo is cheating. Some people are better at conventional, and some people are about the same with both lifts.
If sumo is easier, we would see everyone doing, and we just don't, even among the lighter weight classes. Almost all of your super heavyweight powerlifters are pulling conventional because of the mobility demands of sumo and the mobility restrictions of being huge, but even among lighter weight classes, you still see a good mix of both stances. John Haack, the strongest pound-for-pound male powerlifter of all time, pulls conventional and competes in the 90 kg class.
Greg Nuckols explores this in depth in his article Should You Deadlift Conventional Or Sumo?, and he summarizes his key points:
- Your hip structure will impact your strength and comfort in the conventional and sumo deadlift much more than factors like height and limb lengths.
- There are no factors that make either the conventional or the sumo deadlift inherently easier or harder. It’s more a matter of individual strengths and weaknesses.
- Hip extension demands are nearly identical between the conventional and sumo deadlifts. Conventional pulls are a little easier on your quads, and sumo pulls are a little easier on your back.
- To determine which deadlift style will be best for you, just train both of them for a few months, and stick with the one that’s the strongest and most comfortable with submaximal loads. If that style is weaker with maximal loads, then it’s easy to identify the specific weakness that’s holding you back.
Jeff Nippard provides a similar take in his video Is The Sumo Deadlift Cheating?.