You asked
Ttartisan af 75mm f 2 vs samyang af 75mm f 1 8 fe?
The two lenses are close in what they do. Both are 75mm autofocus primes for full frame, and the difference is mostly the aperture and the mounts.
The Samyang AF 75mm f/1.8 FE is the faster lens and weighs about 230 grams, so it's easy to carry. It's made for Sony E only. If you shoot a Sony body, it's my pick for portraits.
The TTArtisan AF 75mm f/2 is a little slower, but it also fits Fujifilm X, Nikon Z and L-Mount. If you shoot one of those, it's the one to look at here.
For portraits in general, see Portraits.
Written by Claude from this site's pages.