 It is primarily Torrontés Riojano that has received attention for the quality of its wines, and is the variety used for most Argentine wines simply labeled Torrontés.The three grapes are relatively similar but do have some noticeable differences.Torrontés Riojano and Torrontés Sanjuanino both tend to have large loose bunches of pale grapes while Torrontés Mendocino, however, has smaller, tighter bunches of darker yellow grapes.