WTB some quick answers

[B345T]

Hi menz, i haven't found any topic related to this, if i missed it, my bad.
So, i am thinking of starting playing on this server and i am pretty new with the GF content, so i am abit stuck at choosing which class to go with. I am thinking to go either Warlock or or Elemental summoner,leads to simple questions.
Which one of these classes is more useful in parties, if useful at all? pvp/pve
Are they still any good in olympiad?
Which one is more needed, if needed at all, at epics?

Played this game since c2,not-a-nub, so just answer related to gracia final content pls. 
Thx in advance. 

[Pel8]

None of them

[bloodeh]

well warlock - melee trains
EM - mage trains

still both classes not essential

[Memento Mori]

Warlock is useful, but not as it were in c4 - interlude.
EM isn't very useful.

[Predii]

PS is the sh1t!

[valandril]

summoners? only if u want to go solo. EM is quite cool for trains tho.