All reels have the same function, holding line with the ability to retrieve it.
When selecting a reel you should pick the reel you feel most comfortable with and one that suits your type of fishing. Some thought before and after the sale will save headaches on the water. Select the size reel you'll need for the type of fishing you'll be doing the most. Use the correct pound test line to work in concert with the selected reel. This should be designated on the reel box.