First thanks for sharing your opinion. As for what was said... I disagree with almost all of it. Even if you have the perfect exchange, and pick the perfect coin, it still doesn't mean you will make a profit.
Yes you are right, and what i mean good coin is, you are choose coin on that day with pricing up possibility.
When you buy the coin and when you sell the coin are both equally important. In 2018, there were only two other exchanges offering XIN. BigOne had a good reputation (still does) and by using their exchange I increased my chances of making a profit.
Once again, it not because you are choosing BigOne, but because when you are buying Xin, you are on the right time, you are buying sometime when the price of XIN increased. How if after you are buy Xin the price down? Are you will blame BigOne is a bad exchange?
Picking the right exchange to make the trades also affects your profit margin.
This the points, No matter where you buy, if you buy on the right time (with TA, Fundamental or own decision) and right coin you will get profits. Let's see what happen with current Bitcoin Price, if you are buy on Binance few days ago, you will get profit today. It will same if you are buy bitcoin on Bittrex few days ago, you will get profit too. So, it's very clear, your profit not because you are choose BigOne, but it because you are put your asset to the right coin at the time.Again I disagree with that assertion. Which exchange you use to make the trade is vitally important. If you use an exchange and they suspend withdrawals or deposits... you don't make money. If the exchange freezes trades for that particular coin (in my case XIN) then you don't make money. If the exchange is hacked or has a cyberattack while you're making the trade...you don't make money. Which exchange you use is almost as important as when you make the trade.