Pieces of Time for low levels

What map/ maps would you say would be the best place to farm pieces of time, or train, for lower leveled people or for people who have yet to unlock the harder maps?

1. Out of the Memory maps, what map would be the best?
Memory 4
Memory 5

2. Out of the Regret maps, what map would be the best?
Regret 3

3. Out of the Oblivion maps, what map would be the best?
Oblivion 1/2 (mages)
Oblivion 4

Bosses:
Dodo (Memory 5)
Lilynouch

Yes I understand some of the Regret and all of the Oblivion maps are for higher leveled players, but I would like to have all of this as a reference for myself.
(Sorry if this is in the wrong section)