Yup, back in.
Not only to get out faster, but to get out safer.
It's a pain in the butt backing out of a spot when so many people drive big trucks and SUV's
You can't see past them, so you are backing out really slowly hoping somebody isn't driving fast down the isle and whack you as you are backing up. I know the sensors help alert you, but still.
Back in, you know nobody is behind you, you can use the reverse camera to know when to stop and it's easier to pull out of spot.
If you HAVE to pull in forward because there are cars behind you and you can't back in. Just stop well short of cement block.
And always park further out. Don't be a lazy slob and sit there waiting for the closest spot.
Just park away from the crowd, find big spot (corner spot is preferred). If you have too, accidentally, ahem, park over the line and take up two spots. Don't park at a 45 degree angle like a Dbag. Just accidentally pull over the other line and take up two, just looks like you are a bad driver and can't park worth a crap. People won't be mad if you do it that way, and do it near the back of the parking lot. The walk is good for you.