I disagree.
My thought is that most part 141 schools are using instructors that are low time. Many of them want a job at an airline or corporate and are "paying their dues" to build time. They can certainly follow a preplanned syllabus and basically verbalize the preset lesson plans. However, you'll often find more experienced instructors at the smaller schools that can actually give real world experience based instruction. The least experienced instructor that I ever flew with had over 4000 hours. This is in sharp contrast to the 400 hours CFIs at many part 141 schools.
Plus, the cost is less.
You'll hear differing opinions. Might want to check out both. Either way, if your goal is to get the rating, if you work hard, you'll win!
Good luck.