Technically, the Soiree is easier to use. It has two different flanges and fits almost any bottle. You simply insert the bulb into the bottle and pour. Here it is on the wine bottle:
The Vinturi requires holding the aerator over the wine glass and pouring, or you could decant a whole bottle into another vessel (I've never done that but will try in the future all in the name of the science of drinking!)
Here is the vinturi waiting for the pour:
Part One: 2005 Chianti (I'll review this wine in another post)
Well, in the name of experimentation, I'll keep trying ; ). But for the first pour, I have to say that the Vinturi made the wine a lot smoother.
Day Two: At lunch, there was still a part of the bottle left, and I tried both again. The trick with the Soiree is to hold the bottle completely upright as you pour - which for me is a scary proposition, but so far so good, the Soiree held securely in the bottle. The day after, I have to say that the Soiree held its own against the Vinturi.
My highly scientific set up:
Three glasses one un aerated, one glass Vinturi, one glass Soiree