Not sure I see much difference, other than being able to roll your own maps and as such control the tileset and in some situations the mob types inside. The mapping system doesn't provide many specific rewards, as far as I remember most uniques can be obtained from even entry level maps so the only reason to do higher maps is they provide better xp to reach lvl 10. It's also RNG based in terms of progression, where bad RNG can simply prevent you from doing higher maps.
The difficulty scaling is also way different, so that specific builds can in fact complete every maps right from the start, and the "progression" becomes the kill speed and the ability to clear more/harder mods on the map and at the same time a bunch of the maps have bosses that no one bother to do because they're simply way overtuned or have too many one shot potential(in that regard, Grift bosses are a lot better designed since other than butcher, they won't one shot you and butcher has very obvious dodgeable animations).
Maybe you meant white item bases for crafting? Considering crafting is such a waste of time and is basically just gambling your currency away in hope you get an item worth more than the currency you spent on it, and white bases can be obtained for cheap even without doing maps anyway, I'd hardly consider that a valid endgame loot system.
I more or less dislike Grifts overall, but I also dislike maps. Both feel like just treadmill grinds and I don't really see one as better than the other, besides some specific aspects of them.