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9 dBi vs 12 dBi UHF RFID antenna: which one for your read zone?

Both are circularly polarised (RHCP) UHF antennas for India's 865–868 MHz band, with an N-female connector, 50 Ω impedance, an IP67 rating and a mounting bracket. The 9 dBi antenna is the compact one at 260 × 260 × 42 mm, with a 70° × 60° beam, and lists up to 25 m with an Identium UHF 4-port reader. The 12 dBi antenna is larger at 445 × 445 mm, with a narrower 40° × 38° beam, and lists up to 30 m with the same reader.