Recently the best derby has been Wigan/Saints without a doubt, the rugby on show is generally to a good level and games are usually close. I would then say Leeds/Bradford again due to their history in the Super League. Our derby games are generally poor efforts with little skill on show. The passion is definitely there but as a spectacle they have been pretty dull for neutrals.
Of course there are exceptions to all of these derby games.

You have hit the nail on the head by saying 2 sucessful sides- that's the reason you think the Wigan/Saints is the best 'derby'. When the two Hull sides are at the right end of the table there would be absolutely no doubt about the biggest derby in RL. As for more 'history' you must be new to the game!

Huddersfield Keighley. then Huddersfield Halifax.

Which derby has more history than Wigan v Saints and why?

New to the game why?

Wigan v Saints have played many, many finals and semi-finals against each other. The game has history unrivaled by any other game.....

The Hull derby has not been played in the top flight for so many years.

Wigan and Saints are not only the two most succesful sides in the history of the game in this country but they are also two of the top teams now.

A derby like this takes years of building.

Crusaders and Huddersfield is the one I always clear my schedule for. Two teams with so much hatred and history with each other, it's always a hard-hitting, glorious spectacle and a true advert for our wonderful game.

Yes, I look forward to this game all year.

Wiganv Saints was the best on Friday.

Sorry mate you are wrong.

Saints v Wigan is the biggest Derby because of the history and the success that both clubs have had in their long and illustrious past.

I'd go for Wigan and Saints closely followed by the Hull derby