[VariousRen]

RPM, especially if there is no ritual adept available, is only usefull out of combat. Charms provide access to spells with no FP cost attached to them.

Sourcery is good in combat, especially at slinging damage dealing spells and improvising spells that must be done quickly.

RPM is better at "soft" effects such as eliminating smell (a notoriously expensive spell under sourcery), tracking someone, creating light, and so on.

Sourcery is better at "hard" effects such as mind control, damage dealing spells, and anything else that is explicetly done as an advantage.

The two systems mix very well if ritual adept is not allowed, because they span different time scales. In fact, all magic in my current game is a mixture of sourcery and RPM (one level of sourcery includes a level of RPM, but RPM can be learned without sourcery at a discount). If ritual adept is allowed the differences become less pronounced because energy can be quickly accumulated.