FAST is the top as far as CS is concerned, you'll find mostly FAST winning in the various programming competitions held in Pakistan, but the biggest advantage of CS from FAST is the highly established network alumini in the industry. The standard of education is good (as in all unis some teachers are good, some are meh). Socialization depends upon your time management skills and how long it takes for you to grasp concepts. You'll find a tonne of quizzes, assignments and what not to contend with within a given semester. What kind of friends you will make is up to you, but there are not "maila" type of people here if that's your concern.