I don't know if she minds drool? The thing I loved about our Bernese was she was totally dry mouthed. Which to me is a big plus...I totally can't handle the drooling of St. Bernards (and Newfies are pretty bad to I guess?).
It seems like there is some tendencies in Berners towards...I don't know exactly how to explain it, but can be a little funny towards strangers. A little fearful perhaps? I've just met quite a few that weren't totally stable. However, I've also met some that were absolutely lovely, so I think this would be a matter of picking out the right breeder.
I also adored the one Leonberger that I met! such an awesome dog!