Both are quite good. Falzar is more for strategy, while Gregar is more for raw power.
Then, Is Red Moon better than blue sun?
The biggest, and only important difference are the souls you get. Red Sun include Roll, Guts, Serch, Thunder, Flame, and Wind. Blue Moon gets Aqua, Wood, Junk, Metal, Proto, and Number. Most people agree that Red Sun is better because of RollSouls healing and Serchsouls Shuffle ability.
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