Finance

There are multiple functional specializations in MBA such as finance, marketing, human resources, IT, SCM, logistics, operations, systems, general management or sector specific specialisations like travel & transportation, telecommunications, healthcare, banking, insurance, etc. Humanities graduates are eligible for all MBA specialisations.
One must choose MBA specialisation based on his or her interests, prior job experience, and personality, skills and competencies.
Marketing is suitable for extroverts. If you have good interpersonal skills, sales aptitude, leadership qualities, good communication skills and have an entrepreneurial attitude then you must go for marketing. Individuals with good numerical ability can do very well in the field of finance particularly investment banking. If you good at number crunching, have the superior numerical ability, good data interpretation aptitude, problem-solving and creative thinking and you are also a strategic thinker then you must opt for MBA finance. People with social skills and empathy are suitable for HR. To become a good HR manager, you require skills such as organising capability, dealing with grey areas, good communication and negotiations skills, capability to handle changes, capacity to handle conflicts, etc.

Hello Rohit,
There are various differences between two. Let me explain it to you one by one.
Diploma
Diploma in a layman language is a short term course generally up to 2 yrs which mainly focus on training a person in a particular field.They are one of the quick and best way to get a job as their course is more practical oriented. The importance of diploma as compared to degree is relatively less.
Degree
Degree on the other hand, is a long term course which varies between 34 years for Bachelors, 2 years beyond Bachelor for master degree, depending on the course.Degree provide more in depth knowledge about a particular course then diploma. Earning a degree opens more doors for opportunities as compared to diploma. In fact, various career options require at least Bachelor degree.
Therefore, I would suggest you to go for a Degree, I.e. MBA in Finance.
I hope this answers your question to your satisfaction. If so, kindly upvote this answer. If you have any further questions, kindly revert.