all low reps, high sets heavy lifting will get you good gains in size, strength and power. so a low rep range is around 1-15, for sets can be around 4 - 10. all depending on what muscle your training and the style your using. having them mixed up is benifital thats one reasion why there are many different training styles. so knowing which one to pick is not all that important as changing your style every so often. in addition different people will respond better to different styles depending on there curent size, endocrime configurations, goals, age, sex, eating habbits. the list goes on. this is why most people can only give you a general idea of what to do, this is also a cause of great confusion for the general public where someone is told 20 different things all of which say there the best. you get the idea, hope this helps.