In other words it’s just down to what you feel comfortable with.
If your daughter was incredibly fucking ugly with a triple chin, continually farted, and had rotten teeth, then a reasonably good looking WG probably wouldn’t make you feel uncomfortable (as hopefully there’d be be no resemblance).
I’m personally often ‘allergic’ to robotic idiots. If she announces services while looking at the wall and twists away during shagging to concentrate on her mobile phone and shopping, then she reminds me of a sack of potatoes in a rubbish dump. With younger women it often depends on their mood, at least if they’re making some effort at all. As women approach their 30s some have developed their emotional intelligence a bit and can handle being pleasant, some haven’t. I think they’ve maybe learnt to enjoy sex as well, which can sometimes help, whereas with younger women it’s just the hormones of the day...
Just my thoughts...