In this work I studied the Wilson loop operator within two supersimmetric gauge theories, N=4 super Yang Mills and an exact marginal deformation known as N=1 beta-deformed. In the context of the AdS/CFT correspondence, the vacuum expectation value of any Wilson loop may be evaluated in string theory in the limit in which the 't Hooft constant and the parameter of the gauge group are large. In particular, I evaluated certain Wilson loops in this limit finding the classical solution of the string equations in the product space AdS5 X S5 and analyzing the corresponding value for the action. I will show that the equivalence for the expectation values of Wilson loop in the two theories is valid not only for 1/2 or 1/4 BPS loops, but also for loops that preserve a less amount of supersymmetry (1/8 BPS toroidal Wilson loops), and even for non-BPS operator. This last case corresponds to Wilson loop correlators, and the Gross-Ooguri phase transition between the solution described by a connected and disconnected minimal surface is obtained in both theories. Next, I will consider toroidal loops with a different scalar coupling on S^5, recently proposed by Pestun, who proved that the union of the two classes of scalar coupling describe any supersymmetric Wilson loop. I will show that the result obtained in string theory at strong coupling coincides with the one evaluated in N=4 at weak coupling.