It really depends on your install and how the car is set up...
here's my two cents on each class:
Beginner is an introduction to SQ and has a very basic set of rules. It has one seat judging and you don't have a lot of points to work with and most of the points are on the install side of the sheet.
I try and start new guys in Intermediate because it will give you a better feel for SQ competition and the points are more balances between Sound (one seat) and Install.
Advanced is a really strong class and involves two seat sound judging and creativity is brought in on the install side.
Q is a two seat class so unless your car is setup to do two seats it can be a difficult.
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Rick SellersDeep South Nationals - Top 25 SQ Round - June 20th - 21st in Biloxi, MS
www.DeepSouthNationals.com