Miter saws are probably among the best tools on the market. Because of their nature, there are many different versions and variations available. The complexity of tool will dictate the price. Better saws with lots of functions will generally have higher price tag.
The price is usually the main reason why we need to be careful while choosing the best miter (compound) saw. Miter (compound) saw prices can range anywhere from like 50$ (rare) all the way to around 1000$ for really good miter saws. The truth is that most people can't use the best miter saws to their full potential - that's why you need to be careful. If you don't choose wisely, you will most probably buy something that you won't even use and therefore waste your money.
Compound Saw
First of all, you need to know the reason - why do you need miter (compound) saw? Or even better - what do you need brand new miter (compound) saw for? Typically, there are two kinds of people who are looking to buy woodworking tools. Professional woodworkers and homeowners. The difference between them is really big.
Homeowners and professional woodworkers usually need 2 completely different tools. While professionals require top quality, reliable and accurate tools, homeowners can get away with normal, usual tools designed for everyone.
For homeowners, I would recommend normal or maybe compound miter saw without lasers or illuminating lights. In most cases normal miter saw has enough features for most homeowners. If you need extra features, you could buy compound one - it makes you able to bevel cut. For professional users, there are also sliding saws which allow the blade and motor to move forwards and backwards, with laser systems for increased accuracy. But as you can expect, that also costs a lot more than regular normal tool.
However, for both professionals and homeowners, reliability is one of the key factors. Therefore everyone should do a research on popular brands and look for only top quality materials. Also, if you are buying new saw - choose one with warranty.