Survey sim, not an arcade sim. It's by no means comparable to ace combat & the like. It's more like fc3 or xplane in some respects. It has some strengths over dcs, and dcs holds some over il2.
It does focus on one specific time frame/ region and does that recently well
By different crowds, yes- if you want to fly modern jets, you won't find anything there. If you want a large number german or russian ww2 birds, functional in mutliplayer crews when applicable, il2 is for you
Dcs also has a fair number of orphan birds, such as the early kits- aircraft without a setting where they engaged in historic combat. Il-2 gives a better picture of following the course of a larger conflict
Neither simulator is better, they just do different things better than the other