Harris,
A boxblade "moves" snow equally well forward or back, but as previously mentioned, forward is easier on your neck. Moving forward, sometimes snow wants to stick in the box. Once the box is full of snow, a trick I've found is to back up a foot or so with the boxblade still on the ground. Often that will break the snow loose so it will fall free when you lift the blade.
If the swath you need to cut is only as wide as your FEL or boxblade, then either is a reasonable choice for clearing a path. One pass and you're done. If you need a wider path (multiple passes), there is a basic problem with a boxblade and FEL...50% of the snow moved falls off each end. So, in a multiple pass situation, 50% of the snow you "remove" is falling back into a previously cleared area.
Don't want to sound like a snob, but IMO a boxblade or FEL is better at "moving" snow than "removing" it, if you get what I'm saying. This is more apparent the heavier the snowfall and the longer and wider the path you need to clear. You end up moving the same snow many times. Even though the cleared path behind the first pass of a boxblade or FEL looks impressive, the only snow really removed is what's in FEL bucket or box... the rest has just spilled off the ends.
The best solution for not addressing the same snow a second time is probably a snow blower. But any kind of angled blade is a close second best. With an angled blade (front or rear) a little snow will spill off to the opposite side, but for the most part you can keep things moving one direction until your path is cleared.
After clearing neighborhood roads for a few years with FEL and boxblade, I got the chance a few weeks ago to give a frontblade a try. Blade angling made the work much more efficient and enjoyable. It gets aggravating moving the same snow over and over in the bitter cold!
For infrequent use, like you have, or small jobs, a boxblade in either direction will likely do just fine, but if you desire better efficiency you might consider an angled blade.
OkieG