I am not very familiar with WAVI so I researched for it and this is a secure CPU mining project which I think is not really doing well in the market evidenced by the fact that it is not yet listed in CMC -- but you can correct me if I am wrong on this. I am more familiar with VET because I supported when it was still in the crowdfunding stage. Vechain is offering "the public blockchain that derives its value from activities created by members within the ecosystem solving real world economic problems." As for TNB or Time New Bank, I found it discussed in the forum. "TNB (Time New Bank) is a basic blockchain that based on time scenarios in distributed application design. Of these three, I would choose TNB to have the best potential followed by VET  and WAVI is my last on the list. But I don't understand why you are limiting yourself to these three projects as there are many more in the pond all waving and looking for your attention (and money, of course).