Coins on top for 2017 like EOS, VET, ZEC, DASH, NANO, XTZ...
Can they compete with existing coins like DOT, LINK, coins on DEfi.
Should I invest in old coins?
If we only just consider of what the OP has said. The options are less interesting, we can dig more old coins that are already proven good and profitable, not to risk with these coins as mentioned.
DOT and LINK are good also and I have to choose them than EOS, VET, ZEC, and etc...