I sell not only alts, but also rarer cryptocurrencies. This allows me to spread the risks as many alts seem to follow BTC.
In addition, it is easier to analyze younger projects
DragonEX
389 Review
Poloniex
759 Review
ABCC
544 Review
Bitfinex
266 Review
Ethereum
460 Review
Cardano
300 Review
Revain
631 Review
Litecoin
429 Review