Different result in Integral

[parisse]

The target audience of geogebra is not the same as the target audience of Xcas (I don't think they provide a programming language), this explains that they make different choices (and write the corresponding code).
The solve output is a good example, if you return a list of x=... y=... it's much more difficult to extract the solution if you want to do something further, for example in a script or program. The Xcas/Prime answer is much easier to reuse.