I'd still go with driven modal and a waveport; as long as nothing really changes with your feed setup. There is a tutorial for a basic patch included with HFSS 13.
I'm not 100% sure, but I believe its because the driven terminal mode was designed with transmission line applications in mind, whereas the driven modal allows for different modes to be inserted - in terms of the electric field profile, while for obvious reasons you'd only see the transmission line modes on ideal transmission lines.
I'd still go with driven modal and a waveport; as long as nothing really changes with your feed setup. There is a tutorial for a basic patch included with HFSS 13.