When it comes to taking pictures of ducks on things, usually it’s a matter of “who do I have handy?”
If I’m going out specifically to do a wandering photoshoot then I’ll pack a selection of options from the bin of available ducks. When I’m out and about on a normal day I usually only have two or three ducks available in my camera bag (usually Rex and Lumina and maybe Tiger). And if I’m going on a long trip and only have room for which one can fit in my pocket, Tiger usually gets the call.