Which HR and above Cards are More Worthwhile: 4-7 Sk10 or 6-10 Sk5 or 8-14 Sk1?

Just wondering, which setup is better (assuming that all three will take up similar amount of HPs) in terms of post-upgrade sales, battle usage e.t.c?

PS: I am specifically looking at Inugamis, Nightmares, Bloody Mistresses, Wraiths, Witch Commanders, Mithril Golems, Claymore Maids* and practically all SR and above cards.

*Will add more Man and Gods HRs to this list soon

This depends on whether or not you are talking about your whole deck being 4-6, 6-10, or 8-14. 8-14 to me is a complete waste of HP since it only adds 13-20 points for the HR->SR teir, 6-10 is the way to go if you are talking stat wise. Personally I'd rather have a 4-6 Skill 10 over a 6-10 Skill 5 for the reason the skill 5 would be a 18% boost for Nightmare rather than Skill 10 sitting at a 23% boost. That 5% boost over the 18% to each card would be worth well over the 600 points you'd gain from creating the 6-10 over the 4-6.

So, since you have listed High Rare Demon cards, I will give you the best set ups for Demon High Rares.

First of all, let's get rid of the cards that are not worth the value. Inugami is not worth the HP since t doesn't have good enough raw stats and skill effect. Mythril Golem either, unless you plan to be a wallcrusher during Holy Wars.

For attack, the best combination of card stats, skills, and price are 2 Nightmare, 1 Ark Dragon, and 2 Trow Elves or 1 Trow Elf and 1 Witch Commander. Nightmare is the gold standard for Demons, and is a bit pricey, which is why only 2 is recommended since 3 boosts going off is much less likely than 2. Ark Dragon has great ATK, a great skill, and is really cheap. The last 2 spots is up to you. Trow Elf is great for raw stats and so many Demon players have 2 in their ATK decks. However, Witch Commander has good stats as well and gives a big boost to Holy War points.

For defense, the best combination of card stats, skills, and price are 2 Wraith, 2 Bloody Mistress, and 1 Chimaera or 1 Birdman Garuda. Wraith has an amazing skill but awful stats. Other wing cards should be used to make up for the lost raw stats. I would highly recommend 3 FF Bloody Mistresses, but they are even pricier than Nightmare, so only 2 is recommended if you are on a tight budget. The last card choice is between Chimaera and Birdman Garuda. Chimaera has a great effect over Birdman Garuda but Garuda has better raw stats. I would recommend Chimaera over Garuda since Demons have a multitude of attacking options.