My travel pattern is similar to UScolorado1k;

out of 550 nights in my lifetime, 500+ are from Courtyards. I stay there for mostly the same reasons as UScolorado1k but I have a few others to add.

CY gets you 10pts vs 5 for RI, it's also more common than SHS so finding a CY in the vicinity of where you're going isn't difficult. Hotel breakfast is consistently the same, so unless you like eating the same exact stuff every day I find myself venturing outside to grab myself food. I like having the option of going to find something different.
Client/company negotiated rates also have significant input on where I will be staying. Out of the 3 long projects I have been on, 2 had negotiated rates at the Courtyards (one included breakfast into the rate) , the 3rd had a number of Marriotts near it, but the CY had the cheapest rate.

Also, if you frequent the same hotel consistently, you can usually talk to the front desk manager or GM to include other amenities such as free breakfast (I was offered this on one of my project, but refused because I did not eat breakfast at that point)