Honestly, if you have any inkling that you need an rMBP, you probably should not get the rMB.
I have replaced my rMBP with an rMB, but it's because even once the "shiny" factor of the new rMB wears off, the reasoning for the use case is solid: portability above all else.
If you think you need the screen real estate or the power (specifically the GPU) of the rMBP, I don't think the rMB will be a long-term sustainable choice once the "new/sexy" factor wears off (which it always does after the honeymoon period).
If you need uber portable and can live with the compromises that means, it's a great machine, but if you're even having to ask the question, I think your gut knows the answer/the long-term answer, well, there is only one: the rMBP.
I have replaced my rMBP with an rMB, but it's because even once the "shiny" factor of the new rMB wears off, the reasoning for the use case is solid: portability above all else.
If you think you need the screen real estate or the power (specifically the GPU) of the rMBP, I don't think the rMB will be a long-term sustainable choice once the "new/sexy" factor wears off (which it always does after the honeymoon period).
If you need uber portable and can live with the compromises that means, it's a great machine, but if you're even having to ask the question, I think your gut knows the answer/the long-term answer, well, there is only one: the rMBP.