Difference between wine grapes and table grapes
Wine grapes are totally different from table grapes. Both are of same genus vitis but their species are different. Wine grapes are always of one particular species: vitis vinifera but species of table grapes varies.
The purpose of cultivating both type of grapes are completely different.
In comparison to table grapes, Wine grapes are very small in size. Also they have thicker skin with bigger seeds which takes much part of grape. So, they ultimately impart more flavor and color (in red wine) to the wine. Less the size more is the flavor intensity. Table grapes are much bigger in size. Also their skin is thin. Table grapes are much appealing than wine grapes. Also they are more crispy and crunchy
Wine grapes are juicier, much sweeter and are more acidic than table grapes. Table grapes are less sweet and less acidic. Also they have slightly thick pulp with smaller seeds or none at all.
Wine grapes are very delicate. Because, they are harvested when they are at their peak, means when their sugar content is 22 to 30%. So they destroy faster. Whereas table grapes have only 15 to 18% sugar. They are selected to withstand the handling and different types of travel.