For a non-DVR HD receiver, H24 is the only way to go.
if all you use is HDMI sometimes size (smaller) does matter
H24 Dimensions: Width 12.5" Height 1.8" Depth 9.4" Weight 6 lbs.
DIRECTV H25 Reciever Dimensions: Width 8.66" Height 1.12" Depth 5.75" Weight 1.19 lbs.