First of all I would like to make this clear, The BFG Is better than that heaping garbage in every way.
Faster Fire rate. The BFGs fire rate is 30, while the Hecates is 25 The ammo box is counter intuitive beacuse the BFG only loads one yet it fires faster and get this, Reloads faster as well.
Aiming/Movement. The BFGs scope in time is rather slow but not as slow as the Hecate. which takes almost a second to zoom in. Movement is key to get around the maps, but the Hecate feels like your carrying 2 M60s, While the BFG is quite mobile.
Just face it the Hecate is for the kids to think that is better than the bfg so they will buy it and lito can keep watching his anime.