Raspberry Pi 3 Model B vs. 3 B+: Which should you buy?

Changes to the network interface and a small processor revision sound minor but could make a difference for your project.

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Raspberry Pi 3 Model B+ Review - What's New? - Maker Advisor

Raspberry Pi 3 Model B+ is the latest product in the Raspberry Pi 3 range, boasting a 64-bit quad core processor running at 1.4GHz, dual-band 2.4GHz and 5GHz wireless LAN, Bluetooth 4.2/BLE, faster Ethernet, and PoE capability via a separate PoE HAT. 5V/2.5A DC power input.

Raspberry Pi 3 Model B+ SC0073

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Raspberry Pi 4 vs Raspberry Pi 3B+ — The MagPi magazine

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Raspberry Pi 3 Model B - DFRobot

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Raspberry Pi Gets Faster CPU And Better Networking In The New Model 3 B+