I have used HitBTC to sell some of my tokens, but I have never used Yobit. From my limited experience with HitBTC, I found the exchange quite easy to sue and the fees were reasonable. I can't say the same about Yobit, because I have heard a lot of horror stories about that exchange.
I have faced also trubble on yobit. I think it is not a good exchanger and it is not user friendly. Hitbtc is far better than yobit. I use hitbtc without any problem. It is fast, secure and much user friendly. Support team is also active on hitbtc.