Comsol can link with Matlab, and create user-defined function.
Design Model has less option to built engineering geometry
It is only to has all physics problem within a tool
Comsol Multiphysics has a design, meshing and Solver module within the tool and it has all the feature to solver industrial problem and user friend Tool.
Design module has more advantage to build the geometry model with efficient and mesh the model for both 2D and 3D mesh type and it has more features to capture the geometry shape is one of the advantages in the tool to get the accurate result.
In the solver have parallel computing to solve the problem with less time. In Result has more option to variables and user-friendly.
It has In-built function, it is very useful for creating user-defined inputs. In comsol we can solve Fluid mechanics and Fluid-structure interaction problem with efficiently.