B.Arch

It's not possible. You need to either appear for NATA or JEE Mains paper 2. There might be a few average colleges which may provide admission on 12th percentage but it will not be worth pursuing B.Arch from such colleges.

B.Arch and MBA are two diverse courses and difficult to compare. However, to answer your question straight, MBA will is a relatively simple course because there is no technology or highly complex subject in its syllabus. Any person with good analytical skills can obtain MBA degree with minimum and reasonable effort & hard work.

Bennett University in Greater Noida
Lovely Professional University
UPES Dehradun.
And, there are many other colleges in India. Upvote if you like.

Hello Nikhil, the eligibility is:
Candidates must have a minimum of 40% marks in the All India National Aptitude Test in Architecture (NATA) conducted by Council of Architecture (CoA) and must have passed any one of the following courses with a minimum of 50% marks in aggregate:
10+2 with Mathematics and English as compulsory subject or 3 years Diploma (any stream) after 10 years of schooling recognized by Central/State Government with mathematics and English as compulsory subjects.
For further details refer to the following link: https://manipal.edu/foa/programs/program-list/barch.html.
All the best!

Dear,
You can pursue B.Arch programme only through NATA or JEE Mains score. If you don't have any one of them then there is no chance to get admission in top architecture colleges.
All the best.

I think it is not the proper way of asking the question.
Mind that completing a course itself can't get you a nice salary package.
It is your expertise, devotion and talent which actually counts.
Both courses have demand and you can build a great career if you pursue what you are actually interested in.
Again, your talent and efforts can make the difference.
Good luck.