Both soaker hoses and poly drips are designed as efficient ways to water plants and flowers with minimal waste. Both water constantly and need little to no supervision.
A poly drip is a narrow plastic hose or flat tape with small holes, or emitters, along its length. Normally, these emitters are spaced at 6-, 12-, 18- or 24-inch intervals. They release a constant drip that maintains a steady hydration of the surrounding soil with little to no chance of overwatering.
A soaker hose is a larger rubber hose, normally made from recycled tires, that resembles a black garden hose. The rubber material is extremely porous, but there are no actual holes in it. The water leaches out from all angles of the hose, providing a steady but minimal flow of water.
Poly drip irrigation systems include a smaller tube to place around the plants and flowers that is less visually obtrusive. You can place its emitters closer to the plants, which makes watering much more precise. A disadvantage of the drip system is that the thin tubing can be easily punctured by rodents or garden tools.
A soaker hose is extremely sturdy and can withstand a beating without being punctured. However, watering throughout the hose irrigates plants and weeds alike. Also, fine dust and dirt can clog the pores, leading to uneven watering.