Which form of the Bayer Advanced 12 Month Tree and Shrub Protect and Feed II that works better depends on the depth of the roots on the plants/trees you need to treat.  For plants/trees with shallow feeding roots granules could be used, for ones with deeper roots, the liquid would be best as it can be pushed down further with more watering.

Bayer Advanced 12 Month Tree and Shrub Protect and Feed II - Concentrate is mixed at 1 oz per inch of trunk cirumference (not diameter). The amount of water that is used will vary depending on soil conditions and volumes that are easy for applicators to use. The minimum amount of water that should be used is 1 pint per foot of shrub height (or inch of trunk diameter for trees) but you may use 1 quart -1 gallon of water per foot of height (or inch of trunk diameter for trees) as well. Denser soils such as clay do not accept water as readily, so the lower volume of water is suggested.  Since sandy soils can accept more water, using the higher volume of water is preferred. After the soil drench has been applied you should water it in with at east 1/2 inch of water. Note: Water simply acts as a carrier and it is important that even distribution of the product is achieved. Thus, more water may be used if the applicator feels runoff will not occur and proper penetration of the root zone is achieved. Insecticides applied to the soil are taken up by the roots and translocated throughout the tree or shrub. Root/soil drenches offer the advantage of requiring no special equipment to apply (other than a bucket or watering can). However, surface layers of organic matter, such as mulch or leaf litter, can bind the insecticide and reduce uptake. Before applying drenches, it is important to remove or pull back any mulch or dead leaves so the insecticide solution is poured directly on the mineral soil. It is also important to keep the soil around the tree or shrub moist for the next 7-10 days after applications to encourage uptake

It is recommended that you wait until the ground is dry or damp when applying Bayer Advanced 12 Month Tree and Shrub Protect and Feed II-Concentrate since this product has to bind with the soil. The ground should not be water logged when applying the product.