Which would you choose?
I would have to go for the severe thunderstorms event of July 1st/2nd 1968.
By all written accounts (was only 3 at the time so don't really remember anything of the event) an area of the UK stretching in a line from Devon up to Merseyside along the England/Wales border experienced almost continuous thunder and lightning for 24 hours!!! Hailstones measuring 7x6cm recorded at Cardiff Airport. Daytime darkness and widespread red rain from Saharan dust. Cloud tops recorded as being in excess of 42,000 feet.
Would be quite an experience to relive this event.