Better safe than sorry, just stay away from yobit. Heard they manipulate the markets as they wish.
Yes, they do pumps, but so does Cryptopia. Pump and Dump groups love cryptopia and yobit. Is it bad? I don't think so.
Personally I'm not a big fan of Cryptopia, I used to trade a fair bit on their exchange but had a lot of dramas with withdrawals and deposits getting stuck earlier this year and their support is terrible!
As for Yobit, it has a bad reputation for a reason.
It looks like now these problems at Cryptopia have been solved. All things considered it's quite a good Exchange, compared to most. It would be nice to be listed there, and easier than on the number one exchanges.