In PA you can place feed out year round, you just cannot take advantage of it to hunt over. So since you are not hunting, you are fine to place feed out...
Having taken lots of game camera photos of deer in PA, I can tell you corn is the winner. There is nothing deer like more this time of year other than acorns. This year, PA had a complete failure of both red and white oak acorns. This means the deer are really struggling to fatten up for winter. So they are really hitting other food sources hard. Corn is high is carbs, so the deer crave it as the colder temps come. Corn is far cheaper than all that fancy garbage in a big with fancy names.
Outside of the fall/winter months when deer are in hard antler, as in spring into summer nothing beats a good mineral pit for getting deer photos. It can sometimes take a bit to get one established, but once the deer know where it is. They'll usually hammer it hard. I really like the Trophy Rock or more natural minerals for getting a sight established. Once, the deer find it you can start using other types. Higher salt content helps to get the deer interested. However, it is not as good for them as those with more calcium, phosphorus, etc. The stuff I use now I get from a friend who is a deer farmer. He has medicated mineral/feed blocks that help kill ticks and keep the biting flies under control. For sight selection, pick an area near cover that is shaded, close to water(very important) and near a well used deer trail. Deer will find it quickly and utilize a sight like this heavily from April through early August. Around the time the antlers start to harden to tend to not use the mineral pit as often. That is when the corn comes into play...
