If then, why what, how much have you got? I would utilize TAP, explicitly for the reason that the layering of the packets proceeds with much less latency and loss of transmission which is abated with this method. However only with layer 3 does this affect any apparent effect on the operation of the VPN, notably the tunneling aspect and which IPs are allowed through and assignable addresses. The use of UDP possibly introduces another situation where you would need to decide which is the best route to take for you. Each network is different and requires a unique set of parameters. Hope this helps.
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