I doubt that'd come up. I'm pretty sure we are meant to focus on daydreaming and alcohol induced state this year. I'm aware that was a recent exam question from recent years but I'm 95% sure we don't need to know in detail what mediation is, let alone those characteristics ... which are relatively self-explanatory.
Content limitations would decreased because you are usually only 'aware' or focused on one stimuli, such as your breathing, the person talking in the room or the wind outside. If you are taking mediation seriously, you are usually not having bizarre thoughts unlike daydreaming. In mediation you are selectively focusing on stimuli that is in the current, whilst in daydreaming you are focusing on internal events with little awareness of the external world, such as what you are going to do that night.
I don't see how it is relevant to the question, but daydreaming can be an automatic or controlled process but usually the former, so just stick with that. When I'm extremely bored in class I can purposefully daze out which I'd consider a controlled process, but generally it happens as an automatic process. I also think you shouldn't really be talking in 'controlled' or 'automatic' process for this, but your attention. When you daydream, you use divided attention. When you are in mediation, you are using selective attention which could also be called a controlled process. Sorry I'm out of it.
I'm pretty sure the content limitation would always be decreased for mediation, whilst daydreaming it can be increased or decreased.