NATA

Hi,
I'll give you the difference between NATA and JEE: Both the exams share the similarity that is they both are conducted for the admissions to the 5 Year Bachelor of Architecture Course in the various colleges of India but the fact that makes them apart (dissimilarity, can also be termed as difference) is JEE Main Paper 2 is conducted for the admission to the NITs and centrally funded colleges Across the nation and the NATA Exam is conducted for the admissions to the B.Arch colleges in India except NITs and centrally funded colleges. NATA is compulsory Exam conducted by the Council of Architecture and most of the institutes /colleges accept only NATA scores. So, if you plan to stay in Gujarat for your Bachelors then give NATA as there aren't any NITs, IITs or SPA for architecture in Gujarat.
You should rather look at these colleges:
CEPT University, Ahmedabad
Nirma University, Ahmedabad
Indus University, Ahmedabad
Indubhai Parekh School of Architecture, Rajkot
Sarvajanik College of Engineering and Technology
School of Architecture, Vadodara Design Academy
Navrachana University, School of Environmental Design and Architecture
Faculty of Technology and Engineering, The Maharaja Sayajirao University of Baroda
All these colleges accept NATA.