So, are you saying to have an additional Sword-user on top of Leon or just Leon alone is good?
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Just as added input, I played the GBA and NES versions several times each, and here's what I think is the best setup for both.
Frionl/Firion - swords, shields, and black magic
Maria - bows, white AND black magic
Gus/Guy - axes, shields, and white magic
Lionht/Leon - swords and shields, but he's also good with other weapons.
I reccomend shields because (correct me if I'm wrong) they up your evasion pretty good. Swords are almost a must, the best weapons are swords (like the Excalibur from the lady in Dist). The last boss and Astaroth both have hoooooge weaknesses to the Blood sword as well. Bows are the only ones that work in the back row, I'm almost certain (although putting Maria in the front row most of the time is a good idea, to up her HP and defense).
I'm not sure about the statistical differences, but this worked for me the best. In short, a sword-user is a must, and two characters with Cure is a must.