I find the North Lounge quite pleasant, and like the "balcony" area for a bit of fresh(ish) air. I like the fact that there are both showers and manned left luggage within the lounge as well. Also the NL seems to have the option for paper coffee cups and lids (why not in south??) - ideal for a final "stock up" before heading to the gate.

Of course now the shiny gold card has come, the First lounge is starting to steal my affections ...