They're all competitive cars. Just depends on who is driving them.
I don't think you can definitively say that one of them is much better than the others. I think the Serpent is a little better than T.O.P. for fit and finish (materials tolerances), but that on it's own doesn't necessarily make it a better race car. I'm not too familiar with the ARC car other than seeing Josh Cyrul dominate with them at the last carpet nats.