Mercedes only works under certain conditions including slow speed and ONLY on certain limited access highways.
At present Tesla's FSD Beta doesn't even work at all on highways (hope this is outdated in just a few days). Also Tesla is building a system that works everywhere and not just a few select roads under select conditions. While it is still too early to tell when or if Tesla will make L3 but it WILL be L3 everywhere and for all your driving.
Mercedes system is a limited dead end system that won't progress to city streets.
So saying one is ahead of the other is not a fair comparison. I prefer Tesla's EVERYWHERE approach over extremely limited highway only approach.
Tesla should enable this feature for these conditions while the rest is Level 2 until it's good enough. Or is it not even good enough to have hands off in these specific conditions?