You asked
Ttartisan af 24mm f 3 8 mini vs sigma 24mm f 3 5 dg contemporary?
Both are 24mm autofocus primes for full frame, so the choice mostly comes down to mount and size. Both fit Sony E, so if you shoot Sony, either works on your body. The TTArtisan also fits Nikon Z, and the Sigma also fits L-Mount.
The TTArtisan AF 24mm f/3.8 Mini is the lighter one, at about 57 grams, and it's the easiest to carry all day. The Sigma 24mm f/3.5 DG Contemporary is a little brighter, which helps in dim rooms and gives slightly more background blur. Neither has stabilisation, so keep your shutter speed up in low light.
I'd take the Sigma for the extra stop of speed, and the TTArtisan if weight matters most. Check the camera lists on each page to confirm your body is covered.
Written by Claude from this site's pages.