I favour the side stalls, preferably first violin side and back far enough to get a decent view of the woodwinds/ brass/ percussion. Main stalls are okay, but once you get past being level with the fountain (or at least where the fountain used to be) the sound can be poor, especially in vocal music where soloists can get swallowed up.
I avoid the Circle, unless it's something big, loud and spectacular. I once heard a programme by a chamber orchestra which included a Schumann symphony from up there and had to lean forward to try and hear anything at all.
Two seasons ago, I had a seat in a box towards the right-hand side. Not only could I see very little, I heard even less.
Our chief weapon is surprise...surprise and fear...fear and surprise.... Our two weapons are fear and surprise...and ruthless efficiency....
I'll just go where I put I think, having never been before. I've done a proms planner and selected some of the higher priced tickets for three proms, though I think I'll be lucky to get a seat for one of them.
At the Apex of: Armchair - speakers. Slightly elongated equilateral triangle.
The answer is straightforward. The best seats would be in the middle of the hall...about where all those ghastly oiks keep standing and cluttering up the place.
EDIT: Actually, when you look at the economics, it makes sense given the number of seats and the prices you could charge vs the money from said oiks. Bit of a no-brainer, really, surprised old Roger hasn't thought of it before now. Must write to him.