I don't know much about online programs, but I did a full time MBA that cost a lot of money (and then worked at Microsoft for 7 years in a mix of business and engineering management roles.)
I very much agree with Gaylene about your goals being key.
If an MBA is a key requirement for jobs that you want... It is likely that the people hiring for those roles are going to be very interested in where and how (part time v full time) you got it. Part of this is the quality of the education, but an equal part is what a top tier program signals to them about you. In a way the business school has done some of the prescreening for them.
If your goal is to approximate the value of a full time in person MBA... A big part of this value is exposure to your classmates, both in terms of the experience of working with incredible (and incredibly demanding) people, but also in terms of the network you develop. This makes it important that the school is in high demand and has a high bar for admissions. There is a virtuous cycle where good schools attract good students who in turn make them better schools.
If you want to learn specific skills... MBAs are broad and shallow. A lot of the real skills are developed post MBA in a role where you need to go deep. If there are particular aspects that you want to learn more about, then I wonder whether there are individual courses you could take for those. A lot of the good business schools offer executive education courses that cover specific areas, for example. This would also have the advantage of separating the commitment into manageable chunks.
I don't know where you are, but there are some good schools outside the U.S. I considered London Business School and INSEAD, because our plan (ha ha) was to live and work in Europe. I also know of highly regarded schools in Spain and Switzerland. INSEAD has a campus in Singapore.
BTW, I'm not sure whether this has changed, but in 2002 when I did my MBA there was really an age range that was optimal... Late 20s to early 30s. The nice way of putting this is that it is a stage of life kind of thing. But truly, ageist might be more accurate. If this hasn't changed and you fall far outside the range then it might be an argument in favor of an online program.
ETA: look who's advertising to me on this page now. Hilarious.
ETA2: the "London school of business and finance" in that ad is not to be confused with "London business school". It is a for profit school with no affiliation to LBS.
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