Well, it can be evaluated in many ways.
First of all, from the picture point of view. In any case, compared to XB2, the image quality of XB3 is still improved a lot, the appearance of moiré is much less, and the texture speed after transmission is also much faster. But of course, there are many things like blur, frame drop and so on. But that's not too important a point.
Second, from the perspective of playing experience, the XB3 system feels simpler/easier to understand than the XB2. The tutorial will be better than XB2, of course, if you have played XB1/2, then things will be much easier. The most special thing about combat seems to be the "combination" (I don't know what the English for this operation is), and the number of people has changed from 3 to 6/7. So generally speaking, the difficulty will drop a bit, which may be an advantage because the xeno series is mainly about plots rather than combat.
Then there is the plot. I think XB3 is pretty good in terms of plot, at least it is "complete". But I think many places are not "clearly explained", such as why Noah becomes consul N after Mio dies, and why Mio becomes consul M. Why Miyabi didn't die, and what is the principle of consul Y's experiment, and many more. I don't know if it's because they couldn't explain it clearly or something else, but at least it wasn't something that should have happened.
Of course, in terms of music, I feel that the music of XB3 is the worst in the XB series (except XBX, which I have never played). Compared with 1.2, it is a bit worse.
Well, the above are some brief comments (in fact, I feel that I mainly mentioned a lot of disadvantages rather than advantages). If there is anything that needs to be changed, I will add it again in time.
If you want to give points, objectively speaking, it is 7.5 or 8/10 (mainly lost points in music and plot)