It's written in the DB games page notes.
"Despite several characters appearing in both, Dragon Ball Heroes and Dragon Ball Xenoverse do not share a continuity. However we do scale most Xenoverse feats and statements to Heroes, just not vice versa, due to the nature of Heroes incorporating virtually every part of Dragon ball media into itself, and treating the real world world like our own, where the various DB media exists as stories, games etc.
We consider all official Dragon Ball Heroes and Super Dragon Ball Heroes media to be usable for the relevant profiles, however the arcade version is considered the "Primary Canon" and takes precedent over the others if direct contradictions need to be resolved (this does not mean events that deviate or expand upon the story in other media are unusable however).
It is true that there are some inconsistencies among the various different DBH media such as the arcade, promotional anime, promotional manga based on the arcade, Ultimate mission story, Ultimate mission 2 story, Ultimate Mission X story, World Mission story, promotional trailers, Victory mission manga etc. However if you tried to split it into a dozen separate continuities it would not make Heroes consistent, which is one of the main goals of separating continuities in the first place, and it would flood the wiki with a half dozen unnecessary versions of Heroes characters that are virtually identical, while vastly increasing the work needed to upkeep the profiles. Not to mention even within the same media it would still have many inconsistencies often times as well. Furthermore, until Super Dragon Ball Heroes, it was only ever meant to be a loosely connected series of separate scenarios, never a consistent ongoing story in the first place, so trying to make it such is an exercise in futility. As such it has been decided that the best course of action is to accept the fact that Dragon Ball Heroes is inherently somewhat inconsistent, and that all it's media is usable.
DO NOT attempt to split DBH into many continuities, even if there are inconsistencies, or try to claim that other DB media such as alternate DBH content, games like Xenoverse, the anime and manga etc. can't be used for scaling things like cosmology or skills to the Heroes counterparts. This argument has been discussed multiple times and thoroughly rejected, with the current standards being accepted, for reasons above, among others."
Edit: The note itself was accepted
here