We always go for a full structural report, at least you are aware of any problems and can then make an informed decision about whether to buy or not.
Last year a friend of DD1 was going to buy an old school house and the structural survey showed serious problems that had been ‘hidden’ by the owners, although the survey was expensive, the potential costs of putting the problems right would have cost £thousands, she asked the sellers to drop their price, they refused, she later found out that a previous sale had not gone through for the same reasons but the EA hadnt told her.