Well I know that. But if the OP isn't used to dealing with Prestas why bother. I read an awful lot a posts where even experienced riders break the valve stem on Prestas. I've done it.

The nature of the OPs question leads me to assume (it's an assumption and I could be wrong, this would not be unusual - ask my wife) that they are relatively inexperienced with bikes. Shrader valves are easier to deal with. But that's their only advantage, IMO.