Part Time MBA

It depends on what you are doing at the moment. If you are doing a very good job and the one which you like, but you still want to gain knowledge while doing your work then part-time MBA i.e executive MBA can be an option for you.
If you love whatever work you do and if you are satisfied then don't leave the job. If you want to study in the meantime and you just want a degree for the sake of the name then its okay to go for part-time MBA.
But, once you went through rigorous 2-years of full-time MBA in a good reputed college then your behavior, how you talk, how you think, how you perceive others, all these things change. So it is the holistic and total corporate ready education that you will get in a full-time MBA course. You can develop many skillsets and improve on your weakness without worrying about anything else.

Hello there,
I have done full-time MBA and now working with a big company because of my MBA. I am able to do things effectively and that's not because of books and studies only. It's also because of the exposure that I got during that two years. I have given more than 100 presentations in those two years with enormous activities that made me different than what I earlier was. We used to take exams early at 4 AM and also have studied for night lectures.
And because of these things today 9-10 hours of working is very easy for me and I am flexible to work in any environment. Believe me, this makes you different from the crowd. Industrial tours or International tour experience when you use in the interview leaves a good impression on the recruiters. So, I would always prefer that an individual go for full-time MBA only. Part-Time MBA won't provide you with this kind of experience for sure. Most of the companies don't entertain part-time MBA, they demand full-time MBA only.
Challenges that you will face about your professional skills or business minded thinking in the full-time MBA will develop with time.
I hope that your doubts are clear and you have got your answer.