Ok, there are some general rules:

• Depending on your trading style: high volume coins give you more frequent trades. You can trade low volume coins if you are a speculator of satoshis trades (for example STELLAR or QORA or DIGIBYTE)
• Do not trade with GUNBOT on surging coins or just premined coins: for example ZEC or dormant coins that just awakened to the moon: trade them manually
• DO not trade with GUNBOT on falling coins: by falling coins, i didn't mean "dumps". Read news, ask on the forum: if a coin is about to die or have been dropping their price for DAYS, trade them manually, on an exchange that allows you to short.

            Theoretically, the best coin to trade appears like this: