I have decided to download the KuCoin app in order to buy CRO. I now need to swap £100 of DOGE (currently in my TrustWallet) into £100 of CRO and to do this it looks as though I need to swap the DOGE into USDT first. I have 2 ways of doing this and I need to know which will cost the least plz (i.e. less fees):
Method 1 - Send the DOGE from TrustWallet to my KuCoin wallet then convert it into USDT through Kucoin, then buy CRO
or
Method 2 - Send the DOGE from TrustWallet to my Binance wallet, then convert the DOGE to USDT through Binance, then send the USDT from my Binance wallet to my KuCoin wallet, then buy CRO
Method 2 requires 2 transaction fees (Doge to Binance and USDT to Kucoin), depending on the network that both exchanges support it could lead to more an extra useless fee for your case. Method 1 is obviously cheaper.
Method 1 obviously seems like the most direct method but I have read somewhere that it's cheaper to do conversions through Binance so I'm wondering if method 2 could be the cheaper option?
No, and the "conversions" is not always cheaper on Binance. As I said above, it will lead to an excess fee. I don't know where you read that information and if you mean by "conversion" are conducting transfer or token swap, you may mistakenly comprehend the BSC and ETH network.
Do also note that Kucoin accepts CRO withdrawal in KCC chain, so you better take a precaution if you want to withdraw the coin. Don't just find or choose the cheaper network fees option, but understand what it actually does.