I went through 141 all the way, and another thing that 141 offers is connections to the next step in the industry, be it corporate, airline, or otherwise. My school had numerous internship/bridge programs for their students to go and build connections and/or get some unique flying experience over the summers, and such experiences allowed me to get hired at the regionals without many hours. Horizon actually goes to the UND campus to interview.
Just a few things to think about. I can definitely see the advantages/disadvantages to both. It's all in what you want and what you want to pay for.