The TicWatch Pro 3 is a major update of Mobvoi’s premium TicWatch Pro model, whereas the TicWatch E2 is a update to the company’s entry level TicWatch E.
The Pro 3 is superior in all respects, except that the E2 has better water-proofing and would be a good option for somebody who wants to swim a lot with the watch.
TicWatch Pro 3

TicWatch E2

- Launch Date: Late 2020
- Battery: 577mAh
- Processor: Qualcomm Snapdragon Wear 4100
- Screen: Dual-Display 2.0 – 1.4in Retina AMOLED (454 x 454px), FSTN
- RAM: 1Gb
- ROM: 8Gb
- Bluetooth: v5
- WiFi: 802.11 b/g/n
- Sensors: PPG Heart Rate Sensor, Blood Oxygen Saturation, Accelerator, Gyroscope, Barometer
- NFC Payments: Yes
- Size: 47mm x 48mm wide, 12.2mm thick
- Waterproofing: IP68 (light swimming possible)
- Launch Date: 2019
- Battery: 415mAh
- Processor: Qualcomm Snapdragon Wear 2100
- Screen: AMOLED 1.39in (400x400px, 407ppi)
- RAM: 512Mb
- ROM: 4Gb
- Bluetooth: 4.1
- WiFi: 802.11 b/g/n
- Sensors: Accelerometer, gyroscope, heart-rate sensor, low latency off-body sensor
- NFC Payments: No
- Size: 46.9 x 52.2 wide, x 12.9mm thick
- Waterpoofing: 5ATM (fine for swimming)