I wouldn't say I've changed brands. But when all else was equal in the past, I considered Marriott, Hilton, Starwood, Hyatt, in that order. Now it's Marriott/Starwood, Hilton, Hyatt, so I find I'm rarely staying at Hiltons -- just a few nights so far this year.
Among the Starwood brands, I still find myself staying mainly at Westins and Sheratons. But it's the same with Marriott. I rarely stay at Fairfield Inn (1 night this year), RI (0), or SHS (0) - mostly CY's, FS Marriott, and Ren.