It depends on the source frame rate of the content you are watching.
Chances are, you may also want 23Hz and 59Hz rather than 24Hz and 60Hz in your driver settings (as the 23/59 are closer to the non-integer "real world" frame rates of 23.976Hz and 59.94Hz that are actually used in most content)
Presumably you can also use 60Hz HDMI - so I'd chose HDMI - though you need to ensure that your source and display are both in the same 'level space' as HDMI can be used with 16-235 Limited and 0-255 Full range output. (Broadcast video, Blu-ray, DVD all use 16-235 - though PCs can expand this to 0-255 in some situations)
As VGA is an analogue interconnect, there is always going to be a small quality loss in the D/A and A/D processes, and analogue signals suffer more from interference (cable quality is more important, hum and reflections can be visible etc.) particularly on long cable runs. HDMI, being digital, should mean no quality loss from the interconnect, and cheap cables are less of an issue. (If an HDMI cable works, it works)