What are the pros & cons of installing a Condensing Boiler or a Combi Boiler for a new central heating system?

Had a condenser boiler installed last year. Total cost �1.8k. Bosch/ Worcester as recommended by several plumbers here. Very efficient and noticed a drop in gas bills. No tank in the attic, it runs off the mains supply. Hot water at the turn of a tap. Have a separate instant shower not on the system so no worries there. Have 2 bedrooms, living and separate dining room. 8 radiators on the system.