I've trained and instructed under both 61 and 141.
141 is too inflexible, and generally does not offer a training advantage. I would recommend 61 in most cases, and would only do 141 if it is tied to something else which you want such as VA Benefits, a university flight training program, or if it's the only school in your area.
If you're just getting your ratings on your own, 61 is usually the way to go. A possible exception might be a very young person with very poor initiative and work ethic...a 141 program might provide enough structure to force such a student to complete their training. Unfortunately, if you are that unmotivated you probably don't belong in aviation, and will be unlikely to succeed in the long run.
As far as employers go...they could totally care less how or where you got your ratings, unless your school's name starts with the words "United States".