.. also it depends on one's style and company

Clerics have got more supporting and protecting spells, Chaotic Command is good example - hardly a thing one can live without. Wizards (mages and sorcerers) get more offensive ones. In addition clerics are getting more prof. points - it might be essential if you're going to use him also as fighter. The best fighter/cleric, IMHO, is ranger/cleric due to those nice druid spells he have on top of priest's usual assortment.