A 24-70mm f/2.8 lens is the workhorse of choice for a wide variety of photographers and videographers, and nowadays, there a ton of options out there, many at affordable prices. If you are looking for such a lens, this great video compares the Sigma 24-70mm f/2.8 DG DN Art to the Tamron 28-75mm f/2.8 Di III RXD lens.
Coming to you from The Hybrid Shooter, this excellent video compares the Sigma 24-70mm f/2.8 DG DN Art to the Tamron 28-75mm f/2.8 Di III RXD. Both of these lenses are fantastic options that significantly undercut first-party prices (the Tamron is one of my favorite lenses). One important thing to consider is the focal length difference. While on the long end, you are very unlikely to notice the difference between 70mm and 75mm, the gap between 24mm and 28mm is more significant and may make a difference in your work. That being said, the Tamron is both more compact and cheaper than the already affordable Sigma, so if the focal length difference does not bother you, you may end up preferring the Tamron. Nonetheless, both are great lenses that should satisfy the needs of a wide range of creatives; check out the video for the full rundown between the two.