Two instructors isn't a problem, necessarily, though you'd need to make sure you weren't being taught contrary ways of doing things. Having two sets of eyes critiquing you could add some extra insight.

Two different aircraft models, however, is a different issue, especially when we're talking high-wing versus low-wing. Once you've got your PPL under your belt, it's not such a big deal, but getting used to one aircraft is enough for now.