The Samsung Odyssey G7 LC32G75T is significantly better than the Samsung Odyssey G5. The G7 has a better contrast ratio, refresh rate, and faster response time. There is also a better SDR and HDR color side and is clearer. The G5, on the other hand, has built-in speakers and is very cheap.
All in all, the Samsung Odyssey G5 is good. Due to its fast response time, high refresh rate, and variable refresh rate support, it performs well enough to satisfy most of the players. However, it does not show different colors and is not very light, resulting in a low HDR experience. Check the detailed Guide here!