Most portrait photographers have a preferred focal length that they tend to use for most shoots. Two of the most common focal lengths are 85mm and 135mm, and this great video compares the two to help you choose the right lens for you.
Coming to you from Julia Trotti, this helpful video will show you how shooting with an 85mm lens compares to the 135mm focal length. Both are classic portrait lenses, but they render subjects differently, and you may find you prefer one over the other. 135mm lenses tend to flatten the features more, but on the other hand, the increased working distance can make it more difficult to work with, particularly if you are shooting inside a studio. On the other hand, 85mm is generally regarded as the most classical focal length for portraits and is quite versatile in a lot of situations. For most photographers, though, it comes down to personal preference, and both generally make for a great option. Check out the video above to see how they compare to each other.
If you would like to see an in-depth comparison of both 85mm and 135mm along with 100mm and 200mm, check out my article on the four of them here.