If you invest in PIVX; you are making a good investment because this altcoin will go to $50 during the next year.
BTT:
Both coins definitly have growth potential.
WTC probably has a higher potential, but coming with a higher risk.
Guess the future depends if they are able to implement RFID in other sectors.
If they do, this may become a real unicorn.
For RDN I personally see a lower potential, but also lower risk and lower volatility.
Why don't you want to split your investment? Seems to be a good idea here...