The difference between the S3 and S3+ is mainly in the design and functionality improvements. The S3+ has an updated design and a remote control with a 10-key pad, which is useful for IPTV use. Both models share the same hardware and software specifications, such as the Amlogic S905Y4 SoC and Android 11. However, the S3+ does not offer any significant upgrades in terms of internal hardware or memory expansion options. Both models support 4K UHD, HDR, and Dolby Vision/Atmos. The S3+ does have a more advanced remote control with voice selection and faster access to streaming services.