Ultimately the choice between radiators and underfloor heating is a personal one but know that with radiators, your energy assessor is likely to oversize them to ensure the heat pump or boiler is not overworked. Nowadays plumbers no longer take on the role of sizing radiators.
Air heating delivered through skirting outlets or ducts in the ceiling is another option, as are trench heaters which emit heat from the floor. Trench heaters are most commonly used in front of large expanses of glazing.
Electric heat emitters used to be an expensive option due to the cost to run but are increasingly becoming a more popular for those with very low heat requirements. They require low upfront cost and are straightforward to install. These are often used where there is no central heating, e.g. in the form of underfloor electric mats in bathrooms or spot radiators.