I have both 19s and 18s. 19s for summer and 18s for winter. Here's my thoughts: 19s look better on the LS but 18s feel better. Probably because of the availability of thicker tires. I'm also lowered, so it narrows my options even more. I don't ever rub or bottom out, but there have been times on the 19s where I hit a bump or pothole that is unavoidable and cry for a few seconds worrying about rim damage.