I wish I were disciplined enough to be a planner 100%, but in reality, I'm somewhere in between.
I like knowing where the plot is going, what the character arcs are going to be, and which tone and overarching themes/messages I want to get across, with the goal that my story doesn't come off as aimless... but it's been difficult making that happen :')
I think the fact that my story takes so long to produce hurts me in that regard, because my perception of the story and characters shifts a lot with time and I end up forgetting why I wrote certain scenes and even characters into the plot, eventually realizing they no longer serve the desired purpose and have become irrelevant or redundant. My story and cast are simply big. It's years old, has hundreds of pages of notes (most of which are no longer canon) and concept art and scrapped drafts, and has become a lot to keep up with. It takes concerted effort to keep it from wandering too much.
Anyways, I don't think any of that necessarily makes me a pantser... Maybe just a bad planner due to laziness, lack of free time, and my scatterbrained tendency to forget things. ;-;
Gotta admit I haven't planned out my story's conclusion yet either, though I have several working ideas for how it might end. I have a rough outline of the plot, broken down into arcs, and write my scripts as I go.