I think the best altcoins to hold right now are ethereum, litecoin and binance coin. Because of the coins I mentioned from the beginning of
this year the performance was very good at all. I think your choice of coins for NEO and LINK is already an option good for hold. But for IOTA
and BTCT in my opinion is not good for hold, if IOTA this year the performance is not good and for BTCT new tokens that are still doubtful potential.
These are very good coins for profit but you need to consider carefully because the current market is in a big correction and need to have a specific plan when choosing to invest. I think investing in Ethereum, Litecoin or Binance are 3 very good options and you will definitely make a very high profit if altcoin season comes back. Of course, you don't always succeed because the market is very volatile.
Out of this 3 coin you mentioned i would never invest in binance, this coin is manipulated by the exchange and don't like it! It is just my personal opinion