Peterson, no contest. The problem is how much the Peterson Pro-1 costs. Right now it costs $315. I would only recommend this if you're doing tubular lockouts a lot or you are obsessed with tubular locks. The Peterson is many many times more useful. You can use it on all kinds of tubular locks- Octagon keyways, Small bore, Shrouded, 7 pin, and 8 pin.
Here is a link to the Pro-1
If you just want to play around with tubular locks a little bit, go for the SouthOrd.
"Lockpicking is what robbing is all about!" says Jim King.