@BSoul
What have you done academically?
I just checked their website and they are offering Graduate diploma in Business Administration.
Look, if you have done Bachelors then you should go for Masters , it is common sense. Masters carries more value then any sort of diploma, again common sense.
It will definitely raise eyebrows of visa officer for sure. You need to convince him/her regarding your intentions for higher studies.
One of my friends who lives in my neighbour got his student visa from USA refused because he applied for Associate degree right after high school (three years) not Bachelors (because he was unable to get admisison into a university because of his low toefl score). Visa officer asked him why did he choose to persue Associate degree not Bachelors? He was unable to answer her question and was refused on the spot.
Whatever you choose to persue makes logical sense and is in line with your previous studies.