Both speakers are quite transparent, however they differ wildly in character.
Wilson's are more exciting, go deeper and have more punch.
Magico's are less exciting, have perhaps a bit tighter bass with less punch, but are a bit more accurate.
It also depends on room size and what you are trying to get out of each speaker.
Wilson's play really loud without strain given enough high current amplification.
If you are looking for absolute transparency I would add the Vivid loudspeakers from South Africa also to your list.
Vivid's are really fast, and incredibly transparent, with totally unique drivers and technology.
Magico nor Wilson are really raising the bar in terms of technology, I don't buy into the carbon Nanotec thing with Magico as being any great driver breakthrough, they are nice looking nice performing drivers.
Magico does use very expensive crossover parts and their cabinets are extremely well built. Wilson's does use fantastic and extremely inert composites and does use some very good modified drivers.
I don't buy into the Wilson driver mythos, their drivers are very good, commercially available drivers with some mods.
You must find a way to listen to the speakers you are considering that is the only way to go.
You will find that there are plenty of Wilson and Magico fans and it all comes down to taste.