hmmm...
depends on your hero, and your enemies too...
you should always think whats good for you, then see if its also good against your enemy...
for someone like razor, I love the mjolnir + skadi combo no matter who the enemy is...
now for troll warlord, I would give him vladimir since I'm using his melee form mostly during mid to late game... then I decide depending on the situation if I'd go for satanic or mjolnir... basically if the enemies can still hit me hard while I'm attacking, I'd go for sat, but if vladimirs is already fine at keeping me alive I go for mjolnir for the attack speed + the chain and fork lightnings...