It's not a safety issue to replace one tire with a different brand if the size is the same, the tread pattern is close and it's in the same classification. The handling characteristics of snow, all season and summer tires are very different although the all season tries to bridge the gap between the other two. I would look for a used tire locally or off ebay before buying a new mismatched tire.
That said, what are you doing with snow tires in Florida? Snow tires do not perform well once the ambient temp comes up and the tread will wear very fast. That's another reason to not buy a single new tire as the other 3 snow tires will need replacing in no time.
Another thing to consider with the AWD is how the power is distributed and managed. I am not sure but believe the Buick is front drive biased so you would be better mixing the tires on the rear axle than you would on the front if you end up doing so.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
"Don't take life so serious, you won't get out alive..."