Meguiars is ok but there are a lot better brands out there. Like others have said its down to personal preference and what works for you. I have tried CG wet mirror finish and CG butter wet wax and they works great in there own way but CG blacklight I would say is better. It depends on the end look you are trying to achieve to which type of products you need.
I done my brother inlaws black Astra a while ago, I gave it a full decontamination wash and clay, then polished using autoglym srp i then applied a coating of CG blacklight and toped of with Angelwax dark angel for a longer lasting protection. The finished results were fantastic the paint just seemed to pop if that makes any sense and that glossy finish was fantastic.
Once you start to buy products to try and achieve the finish you want you will eventually find something that works for you.
Will it cost much? Yes
Will you have fun trying them out? Probably
Will you regret buying certain products? Most definitely
Will you be happy with your finished result? Only until the postman arrives with another delivery.