Backpack Blower V.S. Handheld

Hey guys I'm new to this sight. I currently mow about 20 yards a week and do landscaping the rest of the week. My hand held Echo leaf blower is starting to die on me. Im trying to figure out if i should just buy another handheld blower or if i should upgrade to a backpack blower. I have a stihl dealership in the area that i really like so i want to go with that brand. One of the problems i have is when it rains i have trouble getting the wet grass and green tire marks off of the customers driveway, would a backpack blower be strong enough to pull the marks off? Also for leaf clean up in the fall what is the power difference and how much time will it realisticly save me blowing leaves exspecially if there wet? The hand held im looking at is 180$ and the back pack is about 500$, next time im at the store i will get the exact models of the ones i was looking at. Any help would be appretiated. Thanks