We built a house and we opted for poured walls. Poured walls are less likely to crack and are generally stronger and less likely to leak. We wanted the faux brick moulded concrete to give it texture, since we just painted the walls. If the block walls are reinforced properly, some people prefer them, because they are generally more straight and 'cleaner'. The problem is, when buying a house, it is impossible to know if they were reinforced properly, where concrete is concrete - can't hide that fact. HTH.
Edit: I'm not sure if you have a full basement or not. We do.