What is the difference between top fermentation and bottom fermentaion yeast?

Answer 1

Bottom fermenting yeast, which produce Lager beers, are fermented at lower temperatures (around 0-5 degrees C), and take roughly twice as long to ferment as ales, which are procuced with top fermenting yeast

Top fermenting yeast produce Ales and are fermented at higher temperatures (around 10-15 degrees C), and have a shorter fermentation time.

Answer 2

Wine should be made with a wine yeast. If you're talking about "top-fermenting" vs. "bottom-fermenting" yeasts, you're talking about beer yeasts. If for some reason you can't get a strain specifically intended for wine, top-fermenting is probably the better of the two choices ... wine yeast and "top-fermenting" yeast are both strains of Saccharomyces cerevisiae (so is baker's yeast, but baker's yeast is a strain that's not really suited for alcohol production ... it's not especially tolerant of ethanol, and dies off when the alcohol concentration is still relatively low). Exactly what bottom-fermenting yeast is is debated, but it's most likely a cross between S. cerevisiae and some other Saccharomyces species.