There are various different responses to this, and many of them, as ever, are that the answer depends on who you are, what you want, and why.
Most straightforwardly, if you don't like new properties but want something with a bit of 'character' and some sort of history and charm, then clearly new builds are not going to be as attractive to you as some older house that has that history, the period fireplace, or whatever else it is that you think you really need in your first home!
But if you have no such strong opinions one way or another, then there are various things to consider that could be pros or cons of either approach.
And because they are new, then naturally you would expect on average there to be less unexpected costs and maintenance work required straightaway: although some who do move into new homes find problems as the first owner, so to counterbalance that there may be various calls to be made to the vendor of the property, but you should have a guarantee for a set period of time whereby you won't have to pay for those things: for instance if the cooker isn't put in properly or you find a chip on moving in to a window or one of the fixtures or fittings and so on, whereas of course anything you spot after you move in to a house that is not new you will have the financial cost to incur as well as the inconvenience of having to get it sorted.
There are also practical considerations: the insulation standards and energy efficiency standards that new builds have to meet are likely to be well-above those for older homes, which means consequently you should have to spend less on heating given the better insulation.
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