Fly fishing allows for an upstream presentation and stealthier presentation. In addition, you can work in tighter quarters when fly fishing. Spin fishing works well for imitating bait fish or crawdads and are presented at all water depths and are retrieved vs thrown upstream and brought to you.

What is the difference between fly fishing and normal fishing?

The main difference between fly fishing and spin or bait fishing is that in fly fishing the weight of the line carries the hook through the air, whereas in spin and bait fishing the weight of the lure or sinker at the end of the monofilament or braided line gives casting distance.