the difference between fpv and ap is that exact part, the real estate to keep interference down isn't there with the stock frame and the square shape makes it hover better than fly. if your doing them 1/4 mile an hour shots in 120fps then slow it down, keep the square frame, but if lets say the op wanted to do geo studies on a mountain or fault, he could make a mile run down the thing and the bigger frames make it do it. The stock frame isn't so much the metal in the pcb cause they both do, mine actualy more, all 8 channels are pcb in the top plate to further clean up wires and make less interference.
a stock 450 sucks going forward with any speed at all for the distances an fpv rig does.
heres a stock frame doing fpv, couldn't get 2200 feet away and tuning for winds and crap was a joke
but go with a spider frame that has room to run an lrs rc control and has range does this
AP wants a nice symetrical frame that hangs something straight off the bottom and hover. It's the other side,,,,, the dark side
frame wise, the only difference between the two videos is the center plates. Same motors, esc's naza, everything. Got it for christmas last year, drowed it twice. sent it to hell a few times...... you know