There are a few things to consider when deciding whether a 2 post or 4 post lift is right for you. The main difference between the two is that a 4 post lift has four support columns, while a 2 post only has two. 4 post lifts are typically more expensive than 2 post lifts, but they offer some advantages in terms of stability and safety.
Because they have four support columns, they are less likely to tip over if something goes wrong during use. They also tend to be more stable when lifting heavier vehicles. 2 post lifts have their own advantages as well.
They are generally less expensive than 4 post lifts and can be easier to install. They also take up less space, which can be important if you're working in a smaller garage or shop. The most important thing to consider when choosing between a 2 post and 4 post lift is what you'll be using it for most often.
If you plan on lifting heavy vehicles regularly, then a 4 post lift is probably the better choice. If you're mostly lifting lighter vehicles or don't plan on using your lift very often, then a 2 post lift will probably suffice.