only 2 question about linq and dataset

Question

hi all hi all, my first question which better data source for forum article ( Posts , replys , images ... etc) xml or dataset or linq ??? i want to use dataset , it will be enough and efficient? q2-i dont found any article in the web pages discuss how to use Sql Data Types (varchar(),nvarchar()..... etc) in linq . in dataset and datareader we know cmd.addparameter.withValue but in linq i dont know how to use it ??? there is any examples of how to use sql datatype in linq by stored Procedure??? and my last question Using Stored Procedure in linq has the same efficiency on Using Linq query syntax??? i dont want to use linq query , because i have complex queries so that i have discussed to use Linq with stored Procedure, its has the same performance?? thx alot all