well i find wen i raid planets with like 125k metal n crystal then theres a big fat load of 750k deut ...i usually make more deut then anything else...so if you looking for specific resource look for planets that are low in the resource you dont want and have a high amount of the resource you want...then send a fleet to grab it...though finding planets like tht is a really time consuming endevour...you should try fo equal res though anyway