I use the dairy trade (milk and eggs) it is fairly easy to replenish those just by collecting from the stables and hatcheries and the trade drops food items which helps with feasts. Plus it only takes two hours.
My second favorite trades are the naga trade which returns 40k coins and the materials are fairly quick to replace if you have several naga monsters, and the monster hunter trade, especially during events that require fighting lots of monsters.
I avoid the energy trades, because the energy required to collect the materials required far outweighs the few energy they return.
If you have any of the white flygers, armored flygers, and dire wolves, those have a rare chance of dropping expansion permits, a high chance of earth wisps, and even wisp lanterns. I check them regularly. (Plus you can make lumen essence and wisp lanterns with all the wisps they drop.)