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Viltrox af 85mm f 1 8 ii vs samyang af 85mm f 1 8 p fe?

Both are 85mm f/1.8 autofocus primes for full-frame cameras, neither has stabilisation, and both suit portraits, so the choice comes down to your camera mount and how much you care about weight.

The Samyang AF 85mm f/1.8 P FE is the one to pick if you shoot Sony E. It's very light at about 270 grams, which makes it easy to carry all day.

The Viltrox AF 85mm f/1.8 II is the more flexible choice. It's made for Sony E, Fujifilm X, Nikon Z and Canon RF, so it works across more systems. If you aren't on Sony, this is the one.

For why an 85mm suits people, see portraits.

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