The Crock-Pot brand triple slow cookers and servers all have independent cooking controls for each unit, as do most other brands including GE, Farberware and Bella. Some models have only high or low settings and choosing a model with a warm option is essential.
Rival's Crock-Pot brand is usually rated as a top performing brand, with features, performance and customer service cited as primary reasons. Farberware follows with two units, the 1.5 quart and 2.5 quart models, listed as best buys by Home and Garden Care. The top-rated triple slow cooker models can be purchased at Wal-Mart, Target, Bella Housewares and Amazon.com.