Tried and tested both, happy with both if used on right type of water (stock sizes).
IMO the Withy Pool rig is the best, I've got total confidence in it coz its saved me from a blank a few times. In a week session my mate and I did on Bluebell a year back, the Withy Pool rig outfished all others, we were the only ones to catch consistently on the whole complex.
Use it with boilies or fake corn/maize, its the dogs!
I've since tied mine in a combi using a section of stiff IQ to give it further anti eject properties and help the hook push away from the lead.
Get on it mate - seriously good. I dont go along with all this why use it over simple pop-up rigs talk. Its good so try it/what you got to loose?
Good luck