That was a short answer. From a sys admin view, UG is easier to setup for
everyone to use a common set of config files. The config files themselves
have a description in them of the option, so there is no looking in multiple
places to see what each option does. No redundant application of options;
tol_display comes to mind, in both the .dtl file and config.pro with the
.dtl setting overriding config.pro.
From a designer standpoint, the ability to make parametric prismatic solids
with out sketching is a plus. Most of our parts are sheetmetal that start
with a rectangular shape and then get a flange added. Sheetmetal flat
patterns that are 2D for ease of passing on to nesting system. Assemblies
that don't have a million (okay, I exaggerated) datum planes so all you see
is planes and no geometry. A consistent user interface where all modules use
the same command structure, not window toolbar for one module and menu
manger for others.
There is more, but this is just a start.