I do use yeast, and yep, most all kits will include Lalvin EC-1118, it is a fail safe yeast, it is also recommended for stuck fermentations, it is a beast! That said, I try to select yeasts that will bring out the best characteristics of the wine I am making, the temperature and alcohol thresholds are among what I look for, for instance, for the latest batch of Red Dragon Melomel, I used K1-1116,
The natural fresh fruit aromas are retained longer , Fruit wines and wines made from concentrates poor in nutrient balance benefit from the capacity of K1V-1116 to adapt to difficult fermentation conditions, s a rapid starter with a constant and complete fermentation between 10° and 35°C (50° and 95°F), capable of surviving a number of difficult conditions, such as low nutrient musts and high levels of sulfur dioxide (SO2) or sugar. Wines fermented with the K1V-1116 have very low volatile acidity, hydrogen sulfide (H2S) and foam production
I also substituted this for the EC-1118 in the first kit I've ever made, German Gewurztraminer (in progress) because it tends to express the freshness of white grape varieties, but 71B-1122 would have worked as well.
Does this make a difference? Maybe, but when I hear that EC-1118 actually strips away the natural aromas and flavors, I tend to want to stay away from it.
When I was making Moscato, I actually searched Italian websites to see which type of yeast some of the traditional Spumante makers were using, and used the same type DV10 and QA23 (S. cerevisiae bayanus), I used a yeast developed for Brunello for my Amarone (BM45).
If it is available and the costs are reasonable, I like to use the yeast developed for a particular wine, or developed to bring out of a wine, what we are looking for.
I think it makes the whole wine making process a bit more personalized and a lot of fun!!!!