I also hate them all, yet I'd put my favourite as the original RBY one, merely because I think it was the shortest one created, plus moltres!

One thing that sucks about them is that it's always the same pokemon in there anyway (machop, machoke, geodude, graveler, onix and zubat) so just take a psychic and a grass/water type and you own the whole place (excluding trainers, who may require other types to be present )