Siegebreaker vs Gravechill Killer

Overall comparison

HERO	Fraction	Element	Type	Rarity	Aura
Siegebreaker	Ogryn Tribes	Spirit	Attack	Rare	-
Gravechill Killer	Undead Hordes	Magic	Attack	Rare	-

HERO	LVL	STARS	HP	ATK	DEF	SPD	C.RATE	C.DMG	RESIST	ACC
Siegebreaker	60	6	14040	1211	881	90	15	50	40	0
Gravechill Killer	60	6	13545 -495	1233 +22	892 +11	96 +6	15	50	30 -10	10 +10

Siegebreaker	Pelting Blows Formula: 1.5*ATK Attacks 1 enemy 2 times.	Electrocute Formula: 6.6*ATK Attacks 1 enemy. Has an 80% chance of placing a [Block Active Skills] debuff for 1 turn if this attack is critical. Cooldown: 3 Block Cooldown Skills	Heavenly Roar Formula: 4.6ATK Formula: TRG_STAMINA0.3 Places a 30% [Increase C. RATE] buff on this Champion for 2 turns, then attacks all enemies. Has a 50% Chance of decreasing the Turn Meter by 30% if this attack is critical. Cooldown: 5 Increase C. RATE 30%
Gravechill Killer	Freezing Toxin Formula: 3.9*ATK Attacks 1 enemy. Has a 40% chance of placing a 5% [Poison] debuff for 1 turn. Poison 5%	Blood Chill Formula: 6.8*ATK Attacks 1 enemy. Has a 75% chance of placing a 30% [Decrease DEF] debuff for 2 turns. Has a 75% chance of placing a 60% [Decrease DEF] debuff instead if the target is under a [Poison] debuff. Cooldown: 4 Decrease DEF 60% Decrease DEF 30%	Icy Veins Formula: 2.65*ATK Attacks 1 enemy 2 times.Each hit places a 2.5% [Poison] debuff for 2 turns. Places a 5% [Poison] debuff instead if the target is under a [Poison Sensitivity] debuff. Cooldown: 5 Poison 2.5% Poison 5%