The experience of buying a modern new build property will be very different to buying, say a house that is 100 years old, and while there are many pros and cons of each type of house, the choice will really come down to what you are looking for in a home.
Ultimately, when it comes to choosing between the two types of houses your motivations behind your initial move will usually be the decisive factor. It is important to remember that every house is different and there are always exceptions to the rule.