This is comparison between esp32 series
ESP32 is a low-cost, high-performance, Wi-Fi and Bluetooth-enabled system on a chip (SoC). It is designed for use in a wide variety of applications, including Internet of Things (IoT), wearables, and smart home devices.
ESP32 features a dual-core Xtensa LX6 processor running at up to 240 MHz, 520 KB of RAM, and 4 MB of flash memory. It also includes a variety of peripherals, including Wi-Fi, Bluetooth, I2C, SPI, and UART.
ESP32 is a popular choice for IoT development because it is affordable, easy to use, and has a wide range of features. It is also supported by a large community of developers, which provides access to a wealth of resources and support.