The major difference is HOW they work, ursa was dependent on shots hitting it and in PvP before the nerf I believe it was 2 shotgun shots and you had full super back, shards is dependant on hits/kills a single kill gives back around 20%~ the only game mode shards is currently an issue in is mayhem and that’s only due to the light amplification buff we get, in general play shards is nowhere near as powerful as that, in most quickplay matches shards will give 1-2 extra supers back whereas ursa had the potential to have you be in captain America mode for the rest of the game (depending on how stupid the other team is). On top of all that, should a BB die mid use the regen perk doesn’t work and they’ll start back at nothing.