In the image below, the Ticketek insignia would roughly be where the playing field is going to be for a league match. That being the case, IMO, the best seats would be in the Brewongle or O'Reilly stands (assuming members and trust areas are not an option for you). Or the purple terrace sections in front of each of those stands. Although, the O'Reilly stand and that side of the ground might see you looking in to the afternoon sun so keep that in mind.
The Trumper and Churchill stands provide a great view of the ground for cricket, but for league, probably best to avoid as you'll be struggling to see what's happening at the northern end of the field when the action is up that end.