@williamatics well I do not think blender has the best 3D paint tools on the market, but I think your getting the wrong impression on them, true you can not pick the map from a menu, if I remember right you do it from the node editor is a bit different but not a bad workflow in my opinion, would not say this is better or worse, using nodes with this and painting masks you can emulate the idea of painting several layers at the same time (a node with a mask texture controlling base color, roughness, and a normal or heightmap for example).
And also you are not limited to a circular brush, it uses the same brush system as for sculpting, you can apply alphas of any shape to get brushes of any shape you want, you can adjust the blend mode, the fallout, and how to apply it be stencils, curves etc…
as far as I know where blender falls behind is with UDIM, and I may be wrong?
Still if you find that applying different maps by hand is a problem thats a strong point for substance painter, I think that will se much more use than huge textures you may only occassionally use on Mari
EDIT: some of the real things I think blender paint tools are lacking are 2D transform like tools and a blur node or tools, like a lot of nodes you can find in substance designer for manipulating the texture in different ways
