I suggest ethereum as it grows higher in a very less time is incredible so in future it will be the no 01 currency after bitcoin. And Etc also seems to be increase in future, to many investors are there who want to invest in Etc.
ETC might be a better coin to get traded in Bitcoin exchanges because the people that made a bunch of money through ethereum look for something new that they could invest in. ETC is not as old as Ethereum though the coin is being updated with new specs that will be of better use for the people that want to use the coin for other things. Ethereum could break the coins official All time high.