Which are the best exchanges to buy AltCoins?
best exchange for newbie
TLDR: I personally think Binance is the best exchange...but it doesn't come with out its flaws..I like alot of different exchanges for different reasons..
Some of the things to measure exchanges on would be
1) Fees - Kind of obvious, you want to not get taken for a ride here.
2) Liquidity - Liquidity is important for especially larger coins because it keeps the price healthy and moving.. stagnant volume can lead to pump and dumps often found on cryptopia (volume sucks, and the coins don't have alot if interest)
3) Layout - This one I actually don't really like any of them.. bitfinex is the closest.. but almost any of the major exchanges you will have to either use coinigy API for a fee or tradingview to make the charts usuable.. there is a google extension that can be added to bittrex to import tradingview charts.. it looks weird but atleast improves the interface from about a 2 to a 4/10... Binance suffers here too, the interface is non-customizable, the sizing the charts is shotty without a log/auto button.. and it bad color scheme for color blind users.. I personally have to use tradingview's charts in tandem with Binance for it to be usable.
4) Coins that you want are actually there (This is where Binance shines and have stolen Bittrex' thunder.. Bittrex is so hard to get coins added onto that a lot of newer interest and money has loaded up on Binance instead).. You may love Kucoin or HitBTC to death.. but if they don't have 4 or 5 of your top 10 fav coins its going to be hard to use it.
5) Category of the future - decentralized.. this I think will be a huge priority coming up that could become even the top ranked thing in an exchange, but will have to solve the liquidity issue any decentralized exchange does at first (I personally think Loopring can do this for ERC20 tokens, but will need something other than wallet protocols to work for BTC pairs.
6) Ease of use.. is the site confusing.. is it easy to use the wallets/signup... Does it take some level or rocket science to figure out the interface..
Heres my ratings for some major exchanges based off of my most important 6 things to look for for each major exchange... just my opinion.. anyone is free to disagree
GDAX Fees - 10 Liquidity - 10 Layout - 2 Coin Diversity 4 Decentralized 0 Ease of Use - 8
Binance Fees - 9 Liquidity - 10 Layout - 4 Coin Diveristy - 9 Decentralized - 0 Ease of Use - 9
Bittrex Fees - 5 Liquidity - 9 Layout (With Tradingview addon) - 5 Decentralized - 0 Ease of Use - 7
Cryptopia Fees - 4 Liquidity - 3 Layout - 4 Diversity - 6 Decentralized - 0 Ease of Use - 6
Bitfinex Fees - 5 Liquidity - 10 Layout - 6 Diversity -6 Decentralized - 0 Ease of Use 5 (some features are easy, but with added things like margin trading, there will be a learning curve)
Bitmex Fees - 5 Liquidity - 10 Layout 5 Diversity - 4 Decentralized - 0 Ease of User - 5 (same reason as bitfinex. exchange basic functions are straight forward, margin can add some learning curve)
Kucoin Fees 8 Liquidity - 4 Layout - 4 Diversity - 5 Decentralized - 0 Ease of Use 5
Etherdelta Fees - 8 Liquidity - 1 Layout - 2 Diversity - 9 Decentralized - 10 Ease of use - 1
Hope this helps.
As a wrap up I think all of these exchanges have something to offer.. and you'll probably have to use all of them at some point or another.. I tend to use Binance the most because it ticks the most boxes for things I favor in an exchange.. GDAX for BTC/USD pairs .. I don't trade on margin because I think its risk/reward is too great but if thats something you'd want to dabble in I'd probably recommend Bitfinex over Bitmex.. all of the charting sucks though so just get used to using tradingview instead.