TH350 better than 400?!?!?

[iluvmy72]

My tranny is in the shop...it's a TH350.....they actually told me I'm better off with a TH350 and a shift kit than I would be with a TH400.....they said they're almost the same but from their experience, the TH350 seem to be more rugged.....also they said I'm better off with my stock cooling system which routes the hoses to the radiator as opposed to a external and he said this tranny will last longer than a 700r4 ever will and if I want another gear, he said I can pick up an add on overdrive unit for about 400 bucks or so and it will help preserve the life of the tranny.....is this new or wrong information because I was told the complete opposite.....this transmission shop is owned by a friend of the family and would never do me any wrong.....My mother in law works there as well but could they be wrong?....I'm just curious....and I'm not worried at all....just thinking about the towing.