A tough pick, I don't have that many images yet and only a few uploaded to Astrobin. I'm just about done with upgrading my gear before next season. But so far the most exciting was C2022 E3 ZTF which was a bit too close for my setup at the time, but it was such fun and at times frustrating to capture something rare that had to be done within a certain time frame.
I'm still very much learning in all aspects of the hobby, but I think I would have to say my first image. I haven't revisited this object yet, but I will as the season starts again. I planned it as I got my first proper setup last year and, though it's not a very good image, it came out ok. Manual focus and no guiding, shot with ASICAP via my computer. I still rate it highly as it was my first image and it's tough to beat that feeling when you put it all together after planning it the first time, though the comet came close:
https://www.astrobin.com/wyhg2c/