What is in your opinion the best altcoin to invest in for 2016 and why. Pls add why folks.

I'm still in Primecoin XPM, CryptoBullion CBX, and Horizon HZ for longterm. Those have solid reputation and a good base for growth.
*** I do not recommend to invest in any mentioned coins without proper research, how it was launched, how it developed, community involvement, stamina, price history and volume, etc. So do your homework cause you're the only one responsible for your funds.
For me the best alternative coins to be a profitable is ethereum and xaur this to are really good the price is really not stable so that we can make some good profit i never tried this coins you mention from the op but i will give it a try i will try longterm of investment soon.