i really cant answer that as i have not had experience with either. my best suggestion is to not get either just yet as i do not feel your tank is mature enough to support too many fish, especially herbivores. Just take things slow because only bad things happen quickly. All too many times I have seen people move to quickly, and lose $100's in livestock. We all have done it starting out and know its one of the biggest challenges to over come.
Another good reason for going slow is you may find that one fish you must have, and your tank will already be stocked to the rim. take your time, do your research, and choose your livestock carefully and not on whims.