Do not take either for PUG PvE. People just get annoyed at the fact they cannot attack enemies and you'll get yelled at. Also, you have much better powers to take 
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I'd take Sonic Cage over Dimension Shift - if you do happen to misuse it (as I often do 
) then at least it's only 1 enemy you can't attack and not loads.
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On the flip side, DImension Shift is probably the best rescue power in the game when a team gets over its head.
As Alvan says, you don't really need either for normal PvE (especially PUGs), but I would also go for Sonic Cage which can be handy vs. EB/AVs, etc. or when soloing. I did have both for a while on my grav/sonic back when you could really mess up teams in PvP with teh cage.
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Hi folks.
Am attempting to plan the levelling of my grav/sonic troller. I have space for either dimension shift or sonic cage but don't really feel like I need both (if anyone has a good argument for both I can re-jig things though)
Does anyone have any suggestions/advice/tales of woe relating to either choice? As background I play PvE exclusively and am often in PUGs.
Thanks a lot.