Adjustable weight benches are probably one of the most common on the market today. These products are sometimes referred to as FID (Flat / Tilt / Tilt) benches, which means that they can be adjusted in the flat and inclined position or in the low position. Many benches offer varying degrees of incline and recline positions that provide a greater range of motion for your exercises. Depending on how advanced or complex your exercises are, it will suggest the type of bench to buy.
The advantage of having an adjustable weight bench with many adjustable angle positions is that you can vary the difficulty of your exercises by increasing or decreasing the angle. It would give you a lot more flexibility than just having a flat bench or a bench with only two or three adjusting capabilities. Of course, benches that have more adjustments (or accessories/options) are usually more expensive, so you'll want to take that into account when making your decision.
The key to finding a good quality bench is to do your homework first and gather information from some research to understand what you will need from a weight bench and what your requirements will be for your workouts. You need to know in advance what type of exercises you want to do in order to accompany them with a team that meets and/or exceeds your expectations. There are many weight bench products to choose from, so you shouldn't have a problem finding the right equipment to meet your needs.