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I don't know how to explain it, but I have a question about spells areas, imagine a spell has a 10´radius circle area, which one work better?

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I'm confused because the lower option its not 10´foot radius its, 12,5´foot radius, taking an extra square of area.

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Your first option is correct.

The origin of an AoE must be the intersection of squares, and squares that are more than half covered are affected.

DMG, p251:

The area of effect of a spell, monster ability, or other feature must be translated onto squares or hexes to determine which potential targets are in the area and which aren't. Choose an intersection of squares or hexes as the point of origin of an area of effect, then follow its rules as normal. If an area of effect is circular and covers at least half a square, it affects that square.

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  • \$\begingroup\$ By that rule, a 10ft radius could also affect a 3x3 cell area, by placing the origin in the middle of the center cell, right? I.e., OP's second diagram, but excluding the N/E/S/W cells as they are not more than half-covered. \$\endgroup\$
    – Cam Jackson
    Commented Feb 9 at 9:42

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