In my (probably biased view) each derby has it's own claims.
Wigan v Saints, traditionally a better game for the neutral but diluted because of other rivalries and general success and also the way that one team seems to have ran away with it in recent times
Leeds v Bradford, normally a decent clash but the weakest of the 4 imo
Cas v Wakey, traditionally evenly matched teams but low attendances and lack of quality are drawbacks
Rovers v Hull, normally not the best quality game but I don't think it can come close to be matched for sheer derby emotion from both players and fans. I genuinely believe that people who do not live in Hull don't understand the emotion of the weeks before and after the games take place.

The best games in SL over the past few years have been Wire v Wigan games, a different level to any other.

When the hell did Wire v Wigan become a derby?

it hasn't become one, but the dislike between wigan fans and wire fans have become derby like. it seems there is a new topic open every day on are boards about little tiny things that become 19 page threads all because each set of fans are trying to get the better of each other.

Wigan are only just up the road from us,so imo opinion it's a derby,and it's the best one right now.

Warrington and St Helens are neighbouring towns so it's a derby. And this is the second biggest one for me.

Widnes are supposed to be a derby match of ours. But it's only a big game for 'Vikings' fans thesedays. For us, it's just another fixture.

Obviously being a Saints Fan I love the Wigan-St. Helens derby, it's usually always a cracker the 28-24 last season was literally the best sporting game i've been to (been watching RL for 6 seasons now, football and others for longer).

However, the Hull Derby is the best. For History the Wigan Saints is far superior, and in SL era, with Wigan and Saints being successful throughout it adds the interest, But the passion, rivalry on display for each Hull team and their fans is simply outstanding.

Winner for me.

wakefield is only up the road from leeds but not classed as a derby, similarly hudds and bradford. tradition dictates that wigan's derby match will only be saints - clubs only have one derby game

So the two biggest derby games both involve Warrington and neither are against the team widely regarded as their traditional derby opponents, brilliant.

Wigan v Saints. When was the last time we played a comeptitive match that was NOT shown on TV? There have been Hull derbies not shown on TV, and even the Sky manufactured Bradford v Leeds game hasn't been on Sky.

No matter what the teams positions are, what their form is, or where it's played......it's on TV because the one that everyone wants to see.

How would you know it has nothing to do with their positions? One of them has always been top end.

If Saints and Wigan were both midtable, no one would really be that bothered.

Yes, but when Saints were top and we were bottom why pick that game for TV when the result was clearly evident?

It's a question that nobody will ever agree on due to personal bias, but I think the actions of Sky, the BBC and RFL speak volumes.

Indeed, did the actions of Sky and The RFL speak volumes when deciding that Leeds v St Helens would be the game that launched the Monday night games?

For me, the Hull derby is the biggest. Leeds - Bradford missed out the odd time after a number of years of below average and dull rugby by the Bulls, if either Saints or Wigan were in the same position (note: for a number of years) the game wouldn't generate as much interest and could possibly not be picked by Sky.

Wakey Leeds is classed as a derby match and in the 60s it was one of the biggest we always played them boxing day & and Easter to the older fans its still wakeys biggest match and still draws our biggest attendance. For wakey it's always been cas fev & Leeds that are classed as derbys with cas becoming the main one in recent years.