If you are going full-time, pt 141 is the best, if part time part 61 is MUCH more flexible. Also a good 61 instructor can save you money by structuring lessons to hit your weak spots, rather than being stuck with a rigid syllabus. I know some instructors who could not a complete a lesson on short field landings pt 141 because there was too much wind, and the FSDO would not let the 141 school do things out of order.

HOWEVER, one big advantage of 141 is stage checks. If you fail a checkride, the 141 school can just mark it as a stage check--which is not on PRIA AFAIK.