The question is usually asked wrong
"Which exchange is best" has no answer. A venue that is ideal for funding in local currency will be awkward for transfers. The one with the widest listing loses on book depth.
The right question is: which exchange is best for my task. What follows is organised by task rather than by ranking.
Task 1: getting money in
Here the size of the offer market decides. More sellers means tighter gaps between buying and selling, which means you lose less on the exchange itself.
On that measure 
Binance leads with the largest P2P in the world. Then 
Bybit, 
OKX and 
HTX — smaller markets, though with less competition their price is sometimes better. Check it against live data in P2P rates rather than by reputation.
A special case is 
WhiteBIT: it has direct pairs to euro and hryvnia, so a coin is bought straight for ordinary money without the USDT hop.
Task 2: moving coins between exchanges
Transfer fees do not scale with the amount, so for frequent operations they matter more than the trading rate.
The cheapest USDT withdrawal in this review is HTX at 0.001 on BTT. The widest network choice is 
Gate with twenty-four and Bybit with twenty, several of them free. OKX has its own X Layer network with free withdrawals, 
MEXC has free Plasma.
Live figures for every venue are in transfers.
Task 3: finding a rare coin
On listing breadth 
Bitget is first with over three thousand two hundred pairs, then Gate with two thousand and MEXC with fifteen hundred.
If you need a coin in the first hours after launch, look at MEXC and 
LBank, where early listing is the signature.
One caveat: a wide listing always means very thin pairs sit alongside the normal ones. Read pair volume before price.
Task 4: trading a large amount
Here book depth decides, not pair count. Binance and OKX lead: only their books are dense enough that a large order does not move the price.
A practical test: if your order is comparable to the pair daily turnover, you are the market. Check in order books.
Task 5: trading derivatives
The most comfortable terminal is Bybit, which also has the unified account: spot, futures and options share collateral. The fullest instrument set, including dated futures and options, is OKX.
For funding, data precision matters: 
Toobit and 
Phemex publish the funding interval per contract, and our funding table shows the next settlement time for Toobit but not for Phemex.
Task 6: earning on holdings
The highest deposit rates in this review are at WhiteBIT: up to 18.43% a year on USDT on a fixed plan, plus a card paying up to 10% cashback in bitcoin.
At 
KuCoin the KCS token pays daily distributions from part of the venue fee revenue — rare among exchange tokens.
What to check beyond the task
- Verification. Confirm in advance that the venue works with your country.
- Funding methods. P2P, card, bank transfer — not everyone has all three.
- Age. Not a guarantee, but Gate since 2013 and
Kraken since 2011 is a long unbroken record. - Transparency. Gate publishes proof of reserves regularly,
WEEX runs a public reserve fund with on-chain addresses.
How many exchanges you actually need
Two at minimum, or cross-exchange arbitrage does not exist. Three is sensible: one large venue for funding and depth, one cheap one for transfers, one for the specific job.
Keeping balances on all three in advance beats moving coins once a route has already appeared.
Frequently asked
Can I manage with one exchange? For buying and holding, yes. For arbitrage no: the gap exists between venues.
Should I keep money on a small exchange? As much as the route needs and no longer. Spreads are wider there precisely because closing them is harder.
Trading fee or withdrawal fee — which matters more? Trade a lot and it is the trading fee. Transfer often and it is the network fee, where 0.001 versus 1 USDT is a thousandfold difference.