Optimization method in ADE_XL or ADE_GXL

Hello,

I would like to know about the optimization tool provided by ADE XL or ADE GXL, 

is this optimisation based on intelligent optimization algorithms (like GA and PSO) or it is simply performing a parametric sweep?

I would also ask to know what is the better environment to run the optimization or Montecarlo analyses, from ADE XL or ADE GXL?

Thank you