correct way to implement multipule users registration form I want to create a site where users get to chose between being an employee or employer. 

So when users first go to the registration they need to be asked which role will they be, and on that choice a different registration form will appear.

What would a good implementation method be?
Thanks
First you need to use Profile 2 module and create two separate profiles for employee and employer roles.

Then you can use module Auto Assign Role or Profile2 Registration Path to allow users select which role do they want to register with.