Tremo,
Of the two options you pose, the Bundle is way better for someone coming from X1 or X2 as both vids include a LOT more material about the new tools in X3 as well as the X series in general, covering X2
For me, Groove's X3 Explained was a lot of repeat of earlier X version vids, and since I have bought all the earlier X1/2 vids, it wasn't that helpful. However, it was ment to be a general introduction for people new to the X series, so for you, it might be great! I think there is a LOT in the bundle, especially for the price and it sounds like YOU need the foundation, which is more deeply covered in X2 Explained...
If I had no vids, I'd buy the SWA bundle which is a steal and maybe Grooves "new features" which gives another perspective on X3s new tools