i love kucoin also. it's soo fast compared to cryptopia. selling and buying is a breeze
To me it's not only that Kucoin works faster, but Cryptopia has left me sometimes with pending transactions for several days. I know that's something that can happen due to infraestructure problems, but nonetheless I lost trust in them.
My only problem with Kucoin is that when I go to withdraw some coins it has me put my 2FA code (just like when I sign up or trade) which changes every few seconds so by the time I have written the amount I need to put a different number for the 2FA and it's confusing. It has even gotten stuck once, I had to do the process multiple times for it to work.
Otherwise, it's superior to Cryptopia in anything else.
Even though the 2FA is a useful security feature, sometimes it can be a bit annoying. Especially if you are trying to type the 2FA code on Kucoin website on your mobile phone, you can get a little bit stuck and miss a good trading opportunity.