Illusionist or Coercer?Follow

I have done some spell research on these two types of chanter, to try to figure out which to play, but I have a few (well, a lot of..) questions.

1) I see that both get hastes, but with different names, and I was unable to find percentages. Which has a better haste? Who provides a better overall DPS increase to the group?
2) Who has better DPS potential?
3) Is it common for Coercers to run out of thoughtstones, or do those thoughtstone spells provide them fairly often?
4) Who provides more power regen to their group? I am guessing Coercers because of the MW type spell, but you never know, I suppose.
5) Does the Coercer slow or the Illusionist DPS decreaser spell provide for better tank survivability?
6) Which would duo better with a rogue type (not certain which one he's going for yet)? Which would trio better with a rogue and a wizard?
7) Which tends to be more desired in groups?
8) Which has a stronger raid role?
9) If YOU were playing one.. which would it be?