I'd recommend offense, cuz Stall sucks in RU. There's a bunch of ridiculously strong offensive threats such as Honchkrow, Braviary, Lilligant, etc such that stall is an effective waste of time. My current ladder team is a Hail offense team, and I'm at #11 on the ladder right now :D
I would suggest posting more in the RU np: thread, good posts there will help you gain a council seat along with getting a decent ranking (like top 20) on the ladder.
But tbh, I despise this new system. It's so much more tedious, and it's now ridiculously hard to get the TC badge, especially if you're a UU player, since the council seats there are permanent (and half of them did not deserve it AT ALL, and they're arrogant pricks for the most part).