There is a specific best Attack/Defense decks for each alignment. These set ups are based on 4-6 Evolutions.
SR Demon Attack Deck:
Leader: Hecate - 20K attack - Great Boost to Demons Attack
Second: Jabberwock - 20.2K attack - Great Boost to Gods/Demons Attack
Third: Jabberwock - 20.2K attack - Great Boost to Gods/Demons Attack
Fourth: Sutekh - 20.8k attack - Great Hit to Defense (All)
Fifth: Sutekh - 20.8k attack - Great Hit to Defense (All)
The Jabberwock! It's just fun to say. This deck is set up with Hecate offering a boss buff, Jabberwock coming in with the next best one you could ask for, and Sutekh bringing a high base and a decent buff in the third spot. I do not use Tiamat in the set up because even with the higher stats, his buff is weak. He is viable though.
SR Demon Defense Deck:
Leader: Hamelin - 20.1k defense - Great Boost to Gods/Demons Defense
Second: Temptress Vampire - 18.7k defense - Great Hit to Foes Man Attack
Third: Death - 19.8k defense - Great Hit to Foes Gods Attack
Fourth: Temptress Vampire - 18.7k defense - Great Hit to Foes Man Attack
Fifth: Death - 19.8k defense - Great Hit to Foes Gods Attack
Yep, Demon SR Defense still sucks. Just use Hamelin with Xuanwu and BM.
Considering this is an SR Demon Defense Deck, this is the only way available to create a workable one. This set up is made with the intention of having a high base amount of attack then shuffling the debuffs to account for either man or god attacking. Realistically for Demons, 3 Skill 10 Wraiths and 2 Deaths as wing cards would be a much better set up. This set up yields just under 100k defense and debuffs for gods/men whereas a 3 skill 10 Wraith 2 Death combination would yield an optimistic 108-122k defense.
Until you get up to SSR Demons don't have a viable defense deck compared to both Man and Gods.