Hi! I am driving myself crazy (and my husband of course) with research on which breed is best for us. I like a lot of things about both breeds but have heard horror stories about Bullmastiffs being destructive. And most importantly I have a 13 year old Shih-Tzu that can be quite bitchy if not left alone. I had a French Mastiff and a Boxer that learned within a couple of days to just leave her alone. My female boxer was like a dog on crack and my French mastiff (male) ate my furniture so needless to say I don't want to go there again. I'm just looking for an honest opinion on which breed has the best personality traits.