Quarter sailpanel seams. Lead filler or ???

[BBC71Nova]

Hey guys. I'd like to get some feedback on the need to lead the quarter sail panel seams. I've personally always thought lead there was the "right" way to go since I've seen a few over the years that have filler there that has cracked. I'm sure it probably depends on the usage of the car and how much stress is applied to the area. My quarters have now been replaced and I need to decide on this before it leaves the shop.

Thanks