I personally prefer ANSYS Fluent as it is widely used for simulating fluid flow because of its easy-to-use UI and general availability. ANSYS works on finite volume, and it has two fundamental advantages:

1. It enforces the conservation of quantities at discretized level, i. e., mass, momentum, and energy remain conserved also at a local scale. Fluxes between adjacent control volumes are directly balanced.

2. Finite volume schemes take full advantage of arbitrary meshes to approximate complex geometries. Experience shows that non-conservative schemes are generally less accurate than conservative ones, particularly in the presence of strong gradients.

I believe it is more of a personal comfort at this stage. Both software have been developed well over the years with robust UI and solvers. I have worked with both and for simple cases like flow in a channel, you would not run into any accuracy or computational issues.

But if you want to understand the basic difference between FVM and FEM for using fluid models, FVM is considered advantageous as Priyom Goswami mentioned.

Choosing one of them still depends on the goals of your project. If you want to create a general model and save time, we suggest using Ansys. But if you want to access physics and its equations and even change it easily, regardless of the time, we recommend COMSOL.

I personally prefer Ansys Fluent, especially for the simulation of turbulent flows. Because in Ansys, there are turbulence models such as RANS and LES, which are more accurate than other turbulence models.