It's not a stretch to say that we'll probably never see a day like this again literally ever.
Just on one day, you had three EF-5 tornadoes in which you could make a case for any of them being the strongest ever. The Philadelphia, Smithville, and the Phil Campbell tornadoes would stack up against any of the most notable ones in recorded history. And then you have the "forgotten" F5 tornado that hit Rainsville, and probably a few more that were EF-4 but could've been classified EF-5.
I remember some meteoroligst said on the Birmingham sounding for that day, 98% of the 60-ish severe weather parameters were completely maxed out that day...