A paladin of Toran would be attempting to emulate the god they love, so the reason to deviate from his favor would have to be intense. Just saying "this suits me better" to me sounds like a thinly disguised 1d10 is better than 1d8.......You would how ever have zero chance at Champion levels without using the favored weapon of your god.
This post is of course too slow also...I think that neither of the reasons are strong enough to justify a skip from the usual "favored armor/weapon/color" guidelines.Paladins are tricky ones, as they are the epitome of faith to the deities. It's not a hobby-work... it's selling their own soul for the cause of their gods/goddesses!
....If you really want to use two weapons...