HFSS 10 vs DESIGNER 2.0

HI, i need help .
Someone knows if HFSS is better than Designer if i need simulate a printed dipole which has a finite ground plane?
I've simulate the structure whit Designer but i've obtained bad result, because the structure have a too higher Γ.

The HFSS simulates 3-Dstructure, but designer simulates 2-D structure.

I had better results with HFSS for a printed dipole(than a 2.5D simulator) however my substrate thickness was 1/4 wavelength. If yours is thinner then a 2.5D may be more accurate.

In my experience, Designer is not as accurate as HFSS for structures with small details such as interdigital capacitors.