Portable Gaming Monitors
The fastest, all other things being equal, are still TN + Film solutions...
You may be surprised not to find such terms as "uniformity of illumination", "Glow-effect" in the lists, but there is a simple explanation for this.
Absolutely all modern matrices of any type can demonstrate both good illumination uniformity and poor; both strongly pronounced "glow" and weakly noticeable. There are no more leaders and outsiders. It is necessary to consider and evaluate not the type of panel, but the specific model of the matrix installed in the monitor.
Response speed, refresh rate, black frame insertion
The fastest, all other things being equal, are still TN + Film solutions. They are followed by the IPS-type, and all * VA models receive bronze. It is definitely not worth focusing on the response time figures indicated by the manufacturers in TX - this is still a profanation. The applied measurement techniques, evaluating 1-2 possible color transitions, never gave an idea of the display speed, since in real use there are tens of thousands of possible transitions, and they all differ in time, sometimes at times.
It is worth focusing exclusively on direct comparisons of models (put side by side and run the same test), instrumental measurements and photo evidence (not the most accurate method, but better than nothing). You will be amazed when you see how different models can differ with the same declared GtG (Gray to Gray) time.
The clarity of moving elements / objects on the Portable Gaming Monitors and the length of the trails (remnants of the image from the previous frame) directly depend on the response time. The lower it is, the higher the monitor speed and the clearer the dynamic image.
In terms of numbers, the maximum time for any color transition should not exceed the time given to the monitor for one frame (1000 ms / 60 Hz = 16.66 ms or 1000 ms / 144 Hz = 6.94 ms, etc.). The larger the discrepancy, the stronger the loops. The desire to neutralize this discrepancy will definitely lead you to the most worthy representatives of the TN + Film camp or to big expenses when buying top-end IPS solutions.
Vertical frequency
Vertical frequency is the second important parameter by which the monitor should be selected and on which the visual smoothness of what is happening on the screen depends. Some of the readers will exclaim: "Why is this not the first most important parameter?" We answer: if the matrix is slow, then there is a benefit from the high sweep frequency, but not great. You will be annoyed by the length of the cables, and the whole point of purchasing such a gaming monitor, frankly, is lost.