I've an Akorn , a SRG & a " brand X" 30 gal. hanging drum smoker ( PBC copy) ( Masterbuilt worlds best children cooker)
Unless you drink the BGE cool aid you realize no cooker is great at everything
Comparing the 3
Grilling 1) Akorn a very good charcoal grill.
2) SRG a good ( though small ) gas grill
3) PBC not a grill
Smoking
1) Akorn works very well as a low & slow smoker, you can smoke at higher temp (350+F) if desired.
2) the PBC is a high temp smoker, very good , actually the more I smoke the more I edge into most cooks being higher temp.
3) The SRG is a fair high temp smoker.
Pizza. 1) Akorn is not in the same league as the other two. High temp 3 min neopolitan pizzas
Poultry 1) the SRG is my gold standard but the other two are great.
Capacity
1) Akorn with a 20 in main rack & 16 in secondary rack 4-5 butts, a whole brisket & a butt
Or with rib rack 8-10 racks ribs.
2) PBC will cook a lot!
3) SRG. A turkey, two chickens , 2 butts , more limited cooking area.
Wow I guess if I could only have one of the three I'd get the Akorn, get the model from Home Depot with the cart/ table.