Oh lord, my brain hurts from reading this thread.

On the original subject: asking this question is entirely pointless. Be a little more specific please. There's no such thing as "which one is better" without talking about a specific qualification such as which one will make more power, or which one will take longer to bow up, or which one will be cooler to brag about to my friends who don't understand the technical details of my choice anyway.

About cams, you will not get reversion from excessive overlap. If you have a long duration on the exhaust cam then it's possible for reversion to happen but it would take a lot of backpressure. Generally any set of "turbo" cams will have high lift on both intake and exhaust, longer-than-stock but not excessive duration on the intake and relatively short (i.e. shorter than the intake) duration on the exhaust. That lets the motor take nice big gulps of pressurized air and at the same time provides short powerful pulses of exhaust gas to help spool the turbo.