Speaking as a Pom who watches an equal amount of NRL/ESL on Setanta/Sky Sports (on average about two games from each comp per week), I reckon there are pros and cons on both sides.
* Eddie & Stevo's commentary can be very irritating and consist largely of catchphrases ("surely it's time for the one pointer!" "It's T-R-Y time!" etc). Personally, I think they dumb the game down and insult the intelligence of some of the audience (although to be fair, a bit chunk of their audience are new to the sport and actually enjoy the histrionics).
* IMO the NRL coverage is far superior and much more analytical. Sterling and Gus give a great insight into the tactics etc and don't patronise the audience and I actually like some of what Johns does. However, wtf have they got Ikin on for? The bloke is terrible. Surely they could find someone more interesting?
* Technically, I'd say Sky's coverage is better but I think the quality of analysis swings things in the NRL's favour overall.
As for the standard of the comps, I'd say that the NRL is stronger on a more consistent basis (although I have seen a few poor matches this year and there are certain teams I now tend to avoid watching) but still Super League throws up some absolute classics (particularly during this year's play-offs).
However, when the best teams come head to head (Storm, Cowboys, Eels, Warriors etc) I'd have to say that the NRL swings it, purely because you have a greater depth of genuine world class players (Slater, Folau, Inglis, Bowen, Thurston, Tahu, Hayne, Mckinnon*, Price..... the list goes on).
Anyway, that's my two-bobs worth.
* By the way, really rate McKinnon from what I've seen of him towards the back end of this season and reckon he'd be a shoo-in for the GB Test side if he was British.