K.J.
When our grown children were little, we sometimes did both--depending on ages, interest, weather, etc. There was not always a trunk-or-treating option.
We have only our 11-year-old left to "Halloween" with. We have not heard of or been invited to a trunk or treat this year. I had thought that they might be more prevelent this year due to Halloween falling on Sunday. Our family does not trick-or-treat on Sunday and I kind of expected area churches might want to have an organized non-Sabbath non-Halloween day trick-or-treat activity.
We will likely trick-or-treat on Saturday and the the couple people I've asked about it in my area said that that is kind of usual/expected. (I will probably have candy on hand for those who do show up on Sunday-- and it wouldn't surprise me if some try BOTH days.)
I would check with friends and neighbors in your area/the areas you want to go to and see what they are planning.