I would say Mangog is stronger, given his origins, but it seems Thor has a harder time with Kurse. Anyone care to weigh in?

kurse.

i don't know much about mangog

Raw physical Strength its a toss up w/ the edge going towards Mangog, Kurse's comic origins as The mightiest Dark Elf Warrior Algrim he was actually is a skilled combatant who's Powers & Invulnerabilities were Elevated by the Beyonder after Algrim's Death, Turning him into Kurse, It's stated That Kurse is Twice as powerful as Thor, But This was During Secret wars 2, Thor was under Hela's Curse . Thor's Physical & Godly Powers were Greatly reduced . In later encounters Thor was able to beat Kurse But Physically seemed near equals, Mangog is an engine of Destruction, very similar to Doomsday,(But a Little smarter) It's stated he has the power of a Billion ,Billion Beings Mangog is Immortal, He has Been Blown up, Blasted, & Hit w/purest lightning, By Odin & Thor , Rune King Thor Scattered his Atoms, But he keeps coming back. Kurse can still be Killed/destroyed He died in Thor Disassembled.

Mangog, Usually requires Thor to utilize His more Powerful/destructive attacks to Take him Down , He has Hit Mangog w/ Unfettered might, The God Blast, & Purest lightning . Were Thor Has(except During Secret Wars 2) always been able to eventually Physically beat Kurse. It seems Mangog's Invulnerability/resilience is greater Than Kurse's

Probably Kurse, but Mangog is certainly more durable.

Dude Kurse is no where near Mangog. Even Odin is sacred of Mangog

Mangog is the stronger of the two. His first appearance he almost destroyed all of Asgard's pantheon.