Note: Emblems make this comparison tricky, so we will not be comparing X*+1 heroes here. As a general rule of thumb, each class node adds +5 to Hero Power. But not all class nodes are equal.
Base Stats
This is comparing base stats
4* 4.70 > 5* 3.70 >
4* 3.60 > 5* 2.60 > 3* 3.50
4* 3.60 > 3* 3.50
Peters versus Berden
4* 3.60 ( x150 ) = 533, 529, 917 approximately
( Edit: Actual stat= 534, 533, 924, 3.2x 533= 1705 att stat versus single target )
vs. 3* 3.50 Berden 470, 425, 688, 3.25x 470= 1527 att stat versus single target
5* 2.60 > 3* 3.50
Base stats
Marjana red 8/8 5* 2.60 ( alliance fellow, I am so jelous )
attack 469, defense 499, HP 984
versus
Nashgar red 8/8 3* 3.50
attack 514, defense 366, HP 684
Special skill damage
Marjana red 8/8 5* 2.60 ( alliance fellow, I am so jelous )
Fast
x4.58 damage to target ( 2,148 attack ) x1.44 compared to Nashgar
35 damage per turn for 6 turns
versus
Nashgar red 8/8 3* 3.50
Fast
x2.9 damage to target ( 1,490 attack )
20 damage per turn for 6 turns
4* 4.70 > 5* 3.70
Grimm > Isarnia until:
Stat
Level
Attack
5* 4.29
Defense
5* 3.55 ( Grimm 4* 4.70 ( Defense 531 ) has a lower Defense Stat than Gunnar 3* 3.50 ( Defense 533 ) )
HP
5* 4.52
Special Skills
Click for Special skills discussion
Mother North, Alberich, Delilah, Joon, Natalya, are some heroes that work fine at 5* 3.70 because of their special skills. They work better at 5* 4.80 or 5*+19 but fine at 5* 3.70 . When at 5* 3.70 they need a decent roster of 4* heroes to support them.
And what are the hero powers listed on their cards when they’re equal? I’ve always thought this was an arbitrary number that doesn’t truly reflect the power of a hero, and thus leads to many poor war matchups.