We just bought a new build - our old house was 150 years old roughly so we're used to period. To begin with I was adamant I didn't want a new build. Thought they'd be small, bland, overpriced, bla bla bla
In the area we're buying very little came up that was as big as our new house. At the end it came down to the one we bought, and a period bungalow. In theory the bungalow was cheaper (offers over 455k vs 515k fixed) but the offers over bidding process means it will have gone for a similar amount. It was a little bigger (maybe 10%) inside but had a massive garden. So on the face of it the new build looked like a bad deal. But the older house needed a LOT doing to it. Stuff that didn't jump out in photos - it wasn't a wreck, but when you looked closely the windows needed done, the nice in photos bathroom was clearly a diy job, the needs a coat of paint kitchen was actually a replacement needed, every wall was a bumpy mess and needed stripped and plastered, oil fired ancient boiler...and on and on. It would have cost a lot of money to get it to good condition but wouldn't have necessarily added that much - as it would then have been way more expensive than the new builds over the road.
We bought the completed new build, moved in 7 weeks later. So far we've had snags, but nothing serious and it's all getting fixed (albeit a little slowly thanks to covid). We've spent money on decoration and furniture, but certainly the decorating was a fraction of what it would have been in the other house as the walls were smooth and white so minimal prep. We don't need to touch kitchen, bathrooms, flooring, windows...
So I think it depends on the area. In our case the new build isn't actually working out more expensive.
I'm also expecting lower ongoing costs than our period house. Old sash and case windows that cost 2k+ per window to replace, for example