Tools >> Generate DAQmx task launches a wizard that permits you to define task characteristics and create the corresponding code. You may want to do this by yourself by manually writing down individual instructions: this may be useful if you already have some existing code that you can reuse with little adaptations or if you have some special need that the wizard cannot fulfil or simply if you are accustomed to write down the code instead of relying on wizards, which is my option.
LoadTask is used to load a task created in MAX and use it in your program. This permits some form of personalization of the task without modifying the source code, with the obvious warning that excessive modifications in the task can ultimately result in abnormal program behaviour or runtime errors.
All these options are legitimate ways to fulfil the same operation, coding an acquistion task: knowing the characteristics of each of them you can choose the one which is most apporpriate to your goal and to your programming habits.
) different from LabVIEW, but having used both I can say that most paradigms are similare and the majority of concepts can be ported from one environment to the other.