I had the same decision to make last year, i ended up with the 32 and i'm really glad i went down that path.
I usually only cook for two people but the space means you can fit things like baking pans with handles and other odd shaped dishes on with no issues. The charcoal usage is practically on par with my old cheap 18" Kamado, so its a win win.
A couple of weeks ago the Wife and I had a BabyQ - Baby shower for around 50 people and the 32 handled it with no issue whatsoever, in fact the 3rd grill was used to hold the drip pans, i could have fit a lot more on:
This is 2 x 6kg briskets, 2 x 3kg pork shoulders, 4 x racks of beef ribs.
Then there are the times where you want to bake, the 32 is an amazingly capable bread oven and has plenty of capacity:
Another nice thing is how easy it is to make a true 2 zone setup, i'm a massive fan of reverse searing steak, in the pic below i brought the steak up to temp on the upper right grate, then took it out and let it rest whilst the grill come up to temperature for the final sear:
If i had my time again then i wouldn't change anything about my decision to get the 32. You'll be really happy with whatever you choose, but for me the 32 was the way to go.