Reading from Trion´s character classification, you find the Bard being regarded as Enhancer, which is fine for any Rogue - especially `Cadence´, the zero point skill giving you 2 combo points at range.
Chloromancers are the only healing class outside the clerics´ area, but need to be regarded as supporters only at any rate, since none of their skills, bei it healing or dps, makes them 1st souls in my opinion. Mixed with a full dps class, this is sweet for PvP as well as group PvE.
Your decision between Cleric and Rogue is a trilateral blade, as it seems.
First you should define your characters field of action.
Will it be PvE or PvP?
Do you wish to help your group survive or simply hand out DPS?
What´s your preference - close combat or actions at range?
Whatever you find out for yourself, several points seem to be quite clear, from what Alpha and Beta tests have shown:
Rogues of any flavour will be great at dps and strategic battles.
Clerics will be superior healers and great at support/enhancement.
Warriors provide best tanking, nice DPS and strategic abilities.
Mages seem to be unpredictable for their opponents, since their skills show nice support healing (Chloromancer), great enhancing (Archon, Dominator) and supreme DPS (rest of list).
Apart from exceptions like Riftstalkers being ready for tanking or Chloromancers being Mages with healing skills, main classes more or less represent what they used to in most other MMOs.
Maybe better discuss this via Vent - there´s so much to choose from ;)