ABS or PLA 3D printer filament? Which one should you use?

There are two main types of filament used in 3D printing. PLA (Polylactic Acid) and ABS(Acrylonitrile Butadiene Styrene).
PLA is the most commonly used for desktop 3D printing. It’s the one used as a default in 3D printing machines. For obvious reasons, it is the it’s quite useful in a full range of 3D printing projects. Reasoning behind this, the PLA 3D filament has minimal odor, has low-warp qualities and does not required the bed to be heated.
The PLA 3D filament is a thermoplastic polyester. Created from such organic materials as cornstarch, sugarcane and tapioca roots, it’s made more widely acceptable because it will break down and bio-degrade at the end of its lifecycle. The advantage of this? Anything made of PLA, such as bottles or 3D printed items, will bio-degrade in the ocean between 6 months and 2 years. A short length of time compared to other plastics that can take anywhere from 500 to 1000 years. Keep in mind, however, that products created with the PLA 3D filament, such as toys, containers, or other such applications, you can view your PLA 3D filament as a type of iron. It will last virtually forever, if kept inside in the conditions intended. However, if left outside in the environment, to be rained on, it will rust and make it quite unusable.
PLA plastic is used in many applications. From toys to containers. Also biodegradable medical pieces. It comes in a variety of grades, medical, scientific, food safe and then the type used for 3D printing. The PLA is mixed with other plastics that make it suitable for 3D printing.
ABS is a common thermoplastic that is popular for injection molding applications. If you are new to using ABS, you will find it a little tricky to work with in the beginning. It is a strong and heat resistant 3D filament with a great processing option. ABS is a 3D filament that needs to have a heated bed for the application to work successfully. You will need a binder or adhesive of some sort, which is as easy as a glue stick, hairspray or a slurry made from ABS. ABS needs to be kept at an even temperature when working with it, as it can come out a bit bubbly and disrupt the visual quality of the finished piece. It can tend to curl upwards if not laid on a hot enough surface. To combat this, make sure your surface is the right temp, is clean of any and all dust and debris, and is flat without any marring.
Compared to PLA, ABS is less brittle and can withstand higher temperatures and more use. A downside of ABS is the odor emitted while printing. Most people are not bothered by the smell, unless in a tight enclosed space. So you will want to make sure that you have adequate ventilation when printing with this product. This is because ABS is created from non-organic materials and creates a more noticeable “burning plastic” smell when used to make parts.
So which is better to use. It honestly depends largely on the project you are doing and how long you want it to last.