$ Bottom line: Which one is better?
Bottom line: Samsung MU6300 is better.
In review of TCL 405 Vs Samsung MU6300, Samsung is better because it has great native contrast and low input lag.
Samsung MU6300 Vs TCL S Series/S405 4k 2018: DESIGN
Stand; the two TVs have stands.
Wall mount; Samsung MU6300 has VESA 400×400 while TCL S405 has 100×100
Borders; Samsung MU6300 has 0.67” (1.7cm) while TCL S405 has 0.39” (1.0cm)
Max thickness; Samsung MU6300 is 2.56” (6.5cm) while TCL S405 is 2.91” (7.4cm)
Max temperature; Samsung MU6300 has 102oF (39oC) whereas TCL S405 has 99oF (37oC)
Average temperature; Samsung MU6300 has 97oF (36oC) whereas TCL S405 has 91oF (33oC)
Bottom line: Samsung MU6300 is better
Samsung MU6300 Vs TCL S Series/S405 4k 2018: PICTURE QUALITY
Native contrast; Samsung MU6300 has 5768:1 whereas TCL S405 has 4171:1
Local dimming; the two TVs don’t have.
SDR real scene peak brightness; Samsung MU6300 has 326cd/m2 whereas TCL S405 has 180cd/m2
HDR real scene peak brightness; Samsung MU6300 has 330cd/m2 while TCL S405 has 178cd/m2
Gray uniformity; Samsung MU6300 has Samsung MU6300 has 6.9 while TCL S405 has 7.1
50% Std. Dev; Samsung MU6300 has 3.9958% while TCL S405 has 3.112%
50% DSE; Samsung MU6300 has 0.212% while TCL S405 has 0.195%
Viewing angle; Samsung MU6300 has 4.1 while TCL S405 has 4.6
Black uniformity; Samsung MU6300 has 9.2 whereas TCL S405 has 7.7
Native Std. Dev; Samsung MU6300 has 0.592% while TCL S405 has 0.960%
Total reflections; Samsung MU6300 has 5.9% while TCL S405 has 5.2%
Pre-calibration; Samsung MU6300 has 8.0 while TCL S405 has 7.5
White balance dE; Samsung MU6300 has 3.08 whereas TCL S405 has 3.97
Color dE; Samsung MU6300 has 2.19 while TCL S405 has 2.22
Gamma; Samsung MU6300 has 2.28 whereas TCL S405 has 2.24
Picture mode; the two TVs have movie.
Post calibration; Samsung MU6300 has 9.4 whereas TCL S405 has 9.8
White balance dE; Samsung MU6300 has 0.22 whereas TCL S405 has 0.29
Color dE; Samsung MU6300 has 1.62 whereas TCL S405 has 0.48
Gamma; Samsung MU6300 has 2.21 whereas TCL S405 has 2.20
Bottom line: Samsung MU6300 is better
Samsung MU6300 Vs TCL S Series/S405 4k 2018: MOTION
100% response time; Samsung MU6300 has 18.7ms whereas TCL S405 has 14.4ms
Flicker-free; the two TVs don’t have.
Black Frame Insertion (BFI); Samsung MU6300 has optional BFI
Motion interpolation; Samsung MU6300 has motion interpolation (30fps)
24p Judder; TCL S405 is judder-free.
Native refresh rate; the two TVs have 60Hz
Variable refresh rate; the two TVs don’t have.
Bottom line: TCL S405 is better.
Samsung MU6300 Vs TCL S Series/S405 4k 2018: INPUTS
Input lag; Samsung MU6300 has 9.2 whereas TCL S405 has 9.6
Supported resolutions; Samsung MU6300 has 8.2 whereas TCL S405 has 8.3
Total inputs; each TV has 3 HDMI, 1 digital optical audio out, 1 composite in, 1 Tuner (cable/Ant) and 1 Ethernet. Samsung MU6300 has 2 USB and 1 component in while TCL S405 has 1 USB and 1 Analog audio out 3.5mm.
Inputs specifications; each TV has HDR10, HDMI 2.0 full bandwidth, CEC, HDCP 2.2 and Wi-Fi support. Has HLG.
Audio pass-through; each TV supports ARC, 5.1 Dolby Digital and 5.1 DTS.
Bottom line: TCL S405 is better
Samsung MU6300 Vs TCL S Series/S405 4k 2018: SOUND QUALITY
Low-frequency extension; Samsung MU6300 has 106.79Hz whereas TCL S405 has 119.87Hz
Max; Samsung MU6300 has 87.7dB SPL whereas TCL S405 has 91.5dB SPL.
Weighted THD @ Max; Samsung MU6300 has 1.691 whereas TCL S405 has 4.885
IMD @ Max; Samsung MU6300 has 11.52% while TCL S405 has 17.03%
Bottom line: Samsung MU6300 is better
Samsung MU6300 Vs TCL S Series/S405 4k 2018: SMART FEATURES
Smart OS; Samsung MU6300 operates on Tizen version 2017 whereas TCL S405 on Roku TV version 7.6
Interface; Samsung MU6300 is easy to use with average smoothness while TCL S405 is easy to use and very smooth.
Ads; the two TVs have ads.
Apps and features; the two TVs have apps and features.
Remote; the two TVs have small remotes.
TV controls; the two TVs have TV controls.
Bottom line: Samsung MU6300 is better.
Conclusion
In this review, Samsung is better because it has great native contrast and low input lag.