Well, I'm looking to do the same, figure out who is better that is. We currently have Cablevision/Fibertel, and the TV is ok/not bad, but the internet is terrible... Crashes daily and we always have to reboot the modem, Skype/YouTube are sometimes not functional, but when only one person is using it to browse (not download) it's ok.
I'm trying to decide between the Arnet(?) 15 Mbps for 150 ARS/month or Cablevision/Fibertel 30 Mbps for $300 ARS/month. Fast, working, internet is important for me, and I hate Telefonica with a passion (probably the same level the President/CEO of Aerolineas does after the AEP SNAFU) and will be going with Personal tomorrow or Monday.
I'm just outside CABA right now, so I'm hoping the internet service will be better in Capital Federal. But for anything under say 12 Mbps or 30 Mbps with Cablevision/Fibertel outside of Capital I say avoid it.