61 v. 141 hours
Actually, or should I say theoretically, 141 does require fewer hours. If you can train in minimum times, you can get your initial Commercial at 190 hours. Now, bear in mind that I said theoretically. As a practical matter, even the Chuck Yeagers of the world need at least a few more hours than the minimums to finish. There is nothing wrong with this, unless it is excessive. It does mean that you should plan to pay more for the course than what the "career consultants" at the school say it will cost.
Part 61 mins for Private, bottom line, are 40 hours, and for Commercial, 250 hours (correction of typo). Here again, most people run over those times.
In my .02 opinion, a 141 school is the way to go if you choose a school over FBO. As you have discovered, 141 schools must meet specific FAA criteria for size and adequacy of classrooms, adequacy of equipment, standardization of syllabus, etc. The Chief Instructor and assistants must meet meet specific FAA quals as well, including taking checkrides with the FAA ASI assigned to the school. Instructors must receive standardization and take a ride with the Chief or Assistant Chief before they can be turned loose. Also, many 141 schools have self-examining authority, meaning that you do not have to take checkrides with FAA examiners after you graduate. That can have its pluses and minuses.
As an aside, there are 141 schools for such things as type ratings. I also believe there are 141 schools for crop dusting and other special aircraft uses as well.
Apart from being trained properly, what you are really after is results. Try to find graduates of the school who've achieved the goal you're after. Ask them if they feel the school furthered their goals.
Hope that helps. Once again, good luck with your choice of training.