b arch or civil engineer which one good

Hello Sir/Ma'am. BArch has more humanities & fine arts subjects - History of Architecture, Design, Basics of Psychology, Architectural Graphics & Computer Applications (CAD & BIM), etc. Some other subjects that spring to mind are -

Building Codes, Regulations & Bye-Laws

Landscape Architecture

Interior Design

Housing

Climatology

Building Services

I have mentioned common subjects in a separate list.

BTech (Civil Engineering) has various subjects which are more oriented towards mechanical behavior of materials & construction & maintenance of varied infrastructure facilities. Over the course of your BTech in Civil Engineering, you will study most (like 80–90%) of the following subjects (some of them are taught as a single combined course) -

Strength of Materials / Mechanics of Materials / Solid Mechanics

Water Resources Engineering - Fluid Mechanics & Hydraulic Machines, Hydrology, Fluid Dynamics, Irrigation Engineering, etc.

Transportation Engineering - Highway Engineering, Railway Engineering, Transportation Planning, Traffic Engineering, Airport Engineering, etc.

Environmental Engineering - Water Supply Engineering, Waste Water Engineering, etc

Geotechnical Engineering - Soil Mechanics, Foundation Engineering, Engineering Geology, etc.

Geomatics - Surveying, Remote Sensing & GIS, etc.

Structural Engineering - Structural Analysis, Design of Concrete Structures, Design of Steel Structures, Prestressed Concrete, Concrete Technology, Bridge Engineering, etc.

There is some considerable overlap between the two courses, some of the subjects are -

Building Materials

Building Construction

Quantity Surveying (Estimation)

Construction Management

Basics of Surveying

Urban Planning

Structural Analysis

Intermediate Structural Design