We stick with the Hilton line when traveling so that's all I have info on. Last Oct we stayed at DoubleTree Suites and have zero complaints. ART stops right outside and there are a couple different routes that make the stop there, it then goes further down the street for another stop before making a u-turn to head towards DL making a couple other stops (depending on which bus route you got on). Most times we would cross the street to get on and had better luck catching various bus route numbers. Also the Toy Story lot is close and you can walk there to get on the bus to DL (we never tried this though). Most days we walked to DL (about 1 mile) and rode ART back at night. No free breakfast and parking is $16. Room does have a fridge and microwave. We walked to am/pm for some breakfast items and drinks, my family isn't real big breakfast eaters so that was sufficient.
In a couple weeks we will be staying at Embassy Suites S. They have a shuttle, not ART, cost is $5 per adult and $2 per child per day. They run on a set schedule, every 30 min, so I imagine there can't be too many stops along the way. Free cooked to order breakfast, parking is $16, and not walking distance. There is also an early evening appetizer and beverage thing so if you go back for a late afternoon break you can take advantage of that.
There's a new Homewood Suites with a waterpark opening in Sept. It's less than 1 mile away, has free breakfast, and parking is $16. If this was open already we would likely be staying there but we'll have to wait until next year!