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Hi Ronn,
Both NAVAL Arch and B.Arch are completely different courses. Users and their requirements are very different. It depends totally on your interest and passion to choose between the two.
I can tell you about the opportunities that an Architect can get after completing his B.Arch. They are:
Entrepreneurs
Architects (Junior/ Senior)
Furniture design
Photography
Construction& Community based volunteering
Infrastructure development
Graphic design
Set Design
Jewelry design
Advance research in Architecture
Faculty @ School of Architecture
History, Restoration and Preservation
Interior design
Product design
Landscape Design
Project/ Construction Management

Syllabus of BCA and B.Sc IT is similar up to 80 to 90% in various universities. Courses on Computer languages, data structure, databases, and networking etc are common. BCA degree course program is primarily focused on in the field of Computer Applications, whereas B.Sc IT degree program primarily focused on subjects with more mathematical and theoretical foundations of computing rather than emphasizing specific technologies. Market acceptance of BCA is little more in comparison to B.Sc IT. Both degrees can only help you to get only entry level jobs and will require acquisition of PG degrees such as MCA and M.Sc IT for a meaningful career.