I use all 3, as far as telling the difference you should be able to tell by the bark. It won't matter unless you were trying to smoke it with just 1 wood type to experiment with flavor.
Team: Smitty's Real Pit BBQ
2 Custom Built Reverse Flow Stickburners
Weber 26.75" OTG
Weber 22.5" OTS
Weber Blue 2000 Stainless Performer