I like both so much, I really would be hard press to choose one over the other. That is revolver vs semi-auto. Dont forget single shots like the encore or contender.
Then I have a pedersoli 20 gauge Howdah double. That is hard to call anything more than pure fun. Not my first choice if I could only have one handgun, but it is fun.
Fun is what you make it. Hunting, bullseye/paper, steel or big black cloud of smoke - are all good fun in my book. I get bored after a while and like to shoot different guns.
The fixed barrel semi auto like Hi Standard or Ruger 22's are the most accuracy for the dollar. Accuracy is fun, right?
The revolvers handle wider range of ammo. Versatilty might lead to fun, if you like shooting rodents with shot in the barn one day and low cost cast reloads the next or full power magnums another day.
I dont have a 9mm, but; I need to get another one. Maybe another Luger? Is nostalgia fun? I think so. I see low cost bulk 9MM ammo and low cost shooting is more fun than hi-dollar counter part.
Then there is a certain smith & wesson cannon, that I wont mention. I dont consider reloading fun, so low cost factory ammo is a plus. OK, then a cannon can be fun too. More gratification per trigger pull.
If I could cop-out and pick two, it would be a 22lr semi and a 44mag single action revolver. Replacing both new today, two Rugers.