best exchange/trading platform

[rustylife]

What do yo use?  

[cterra1]

Bitstamp, cause EU SEPA transfert

[notlist3d]

coinbase is very easy if you are US and need to buy.  Takes time to set up, but good long term.

[BiTJack]

Usually coinbase or localbitcoins both works fine for me.

[keyscore44]

Never had any problems with Localbitcoins, BTC-e is another decent exchange though it can be a bit of a pain transferring money depending on where you live. For trading alt currencies I usually go for Cryptsy or Bittrex (used to use Mintpal til they got hacked).

[Buziss]

+1 for localbitcoins.

It is very easy to use and the whole trade can be done in minutes with bank transfer within the same bank.

[Buziss]

What about Chinese exchanges/platforms? What are the biggest ones?

The biggest Chinese exchanges are BTC China, OKCoin, Huobi and LakeBTC, but there are also some accusation of faking trade volumes for those Chinese exchanges.

[Aesara]

crypsy, bittrex, poloniex i think

[BunsenBurner]

What do yo use? 

For me, I use localbitcoins and btc-e mainly for buying some bitcoin.