Apart from having red/blue etc. tanks, i can’t think of why my ultimate defence team should differ from my war defence team. I’d like to hear opinions 
War defense might shift depending on the war extra you get: aid, boost, or arrows. If you know you are getting one and not another, you might choose different heroes to capitalize on that extra. 
For raid defense, I put up a lineup that is hard to clear in one go. War defense, realizing the opposing team can use multiple flags, I put up teams that still maintain some survivability even if tank and main heals and defense are taken out.