Toyota - Ok franchise, good general mix of repair and maintenance work. Customers are cool with maintenance work (including brakes, etc.) but blow a gasket at repairs.
Scion - see Toyota is dualled, else it is either people with a little less scratch or kids with parents covering bills. Either way the repair work isn't there as much and the maintenance is a struggle.
Subaru - I am a Subaru nut. The service end is flat out money. Great repair work with solid maintenance. Extremely loyal customers and if the dealership has the customer base it is great. The main problem with Subaru is it is almost always dualled with something and gets the raw end of the deal - which customers feel and don't respond as well. I'd rather be at a pure Subaru store writing 50 tickets a day, than a Pontiac/Subaru store writing 80 tickets a day.
Mazda (pretty much see Subaru) - buyers not loyal to brand, does poorly when dualled, better when alone. Good repair work - customers are a little better spenders than a domestic customer
Honda - I really don't like Honda - all low gross junk that you have to manage volume efficiently to make work. Customers are whiny compared to Nissan and Toyota. In most areas you almost have to be bilingual to work at one.
Mercedes Benz - MONEY ... pure MONEY. The downsides are those pesky overdemanding customers - but these people (even the ones with the $35,000 C-Class - which is the majority) expect way too much. The techs are often prima-donnas and unfortunately tough to replace, and the factory reps can sometimes be overbearing. A lot of your extra gross gets tied up in support people to jump through all of MBUSA's hoops. If you can handle all of that - in a moderate volume, then they are good money.
If it were me, and the dealerships were all owned by say the same dealer so there were no variables but franchise, and they all could match my salary needs, I would go:
Toyota/Scion
Subaru
Mercedes Benz
Mazda
Honda
[This message has been edited by robc (edited 06-06-2008).]