Assuming this is an evolved trait of the world, then some plants will have logically evolved around this trait. Since you have stated that manasynthesis is more efficient than photosynthesis, then I would expect these plants to angle towards these magical currents just like our plants learn towards the sun now. In addition, expect these plants to either die or hibernate when the mana winds are not over them, depending on if/when the winds cycle back to the same spot over time.
A brief look at Wikipedia's article on Seed Dispersal outlines the main ways that seed disperse: Through air or water, attached to other animals, or ingested by animals that then deposit them.
The main question is if the physical winds and the mana winds blow in the same or a similar direction. If they do, then a directed aerial propagation by means of the flower head pointing in the direction of the mana stream would still be plausible. It might not be as effective, but with a high enough success rate, it might not be urgently selected out.
Another consideration if if the magical flora can build a seed capsule to ride the mana streams? That would defintiely help your plants find a suitable home as they can only fly far in air saturated by a mana stream. So aerial propagation would still be a strategy, but it rides on the currents of magic as opposed to the wind.
Related to this, propagation through water would have similar concerns. However travel by water is a lot more limited in concept. Any manasynthetic plants that disperse their seeds through water are likely to thrive only in oceans, seas, and similar large bodies of water.
A final consideration for this part is what will the burgeoning manasynthetic plant seeds need to sprout? Do they germinate in the mana currents, then land and root? Do they require magically enriched topsoil and/or rains in order to sprout?
The biggest difference in this part is if the manasynthetic plants require some form of magical energy from whatever animal that disperses its seeds, or derived from the plant itself upon interaction with said animal.
An idea is that a critter eats the berry and its seed(s). The critters gets energy from the berry as normal and the seed(s) gets the leftover magical energy from the berry as extra food to prepare for germination.
TL;DR: I don't see why dispersal methods would be notably different. But I would expect specialization to take advantage of the mana currents and their effects.