User blog comment:Ein Inferno/NP Damage Comparisons/@comment-25712820-20191116173114/@comment-32377766-20191219033301

They all have advantages and disadvantages

Buster NPs frequently belong to gold Servants with exceptionally high stats and skills that immensely increase their damage. For example, Enkidu, Jalter, Musashi, and Bryn are really high on the list, and Arjuna Alter, Gilgamesh, Karna, Iskandar and both Ishtars are among the strongest AoE damage-dealers. Buster has the disadvantage of not making it easy to get NP charge to reuse the NP over and over again, but many Buster Servants have NP battery to make up for this, or, like King Hassan and Musashi, excellent NP generation. Additionally, Merlin provides incredible heals (his 3rd skill is a 3,000 HP heal) along with 50% Buster damage up for 3 turns and crit up for 1 turn, and one use of his NP (which can be spammed) heals for 5,000 HP total, assuming your Servants live long enough, which they probably will thanks to his Invincibility. Non-NP Buster cards deal 150% base damage to begin with, before any buffs.

Arts Servants generally have weaker damage NPs and buffs than Quick or Buster, and don't generate many crit stars, but they do allow people to spam their Servants' NPs over and over again, which is great for stall fights if you have a healing NP like Merlin's or a defensive one like Mash's. Non-NP Arts cards deal 100% base damage.

Quick cards are given a higher multiplier to make up for the fact that normal Quick cards deal 80% base damage. A few Quick NPs can loop (be spammed), depending on the amount of damage they do to enemies, and it's even easier to do with Waver or Skadi, who can each provide a 50% NP battery to a single Servant. Quick cards generate more critical stars than Arts or Buster cards, which was their gimmick since the beginning of the game (the fact that they have a chance to deal double their normal damage on the non-NP cards), but without critical stars or NP battery it's difficult to get Quick NPs to loop. Quick AoE Servants are mostly used for farming, and their critical stars are often used to finish off the third wave. Additionally, Skadi, the best support Servant Quick has, can't heal the team, despite being able to make a 1-turn party-wide Evade with her NP, which is easier to pierce than Invincibility.