Sometimes in key battles spells like holy power and divine shell can serve you far better than the extra feats a fighter gets. I am not totally sure about paladins, but i know my battleguard is a better melee unit than my barbarian in terms of damage when i use his excellent self boost spells. A paladin has the same amount of HP as a fighter, and aside from weapons specialisation which you could just get 4 levels of fighter for, there arent really much else going for the fighter.
If he is a paladin of helm, get WS, then go back to paladin. Otherwise stick with the paladin. That is my humble recommendation.
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E.Bill
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