Which early HMS Africa was more formidable?

Which of the first two ships named HMS Africa was more formidable?

The second, the 1781 Africa, because her independent fight against the Franco-Spanish fleet at Trafalgar was extraordinary for a 64-gun third rate.

The comparison favors the second of the two early Africas. She was a 64-gun third rate, the smallest rating within that category. At Trafalgar she approached the Franco-Spanish line alone and fought through the battle. Her combat record is jokingly described as "plot armour" because surviving that independent action seems almost implausible.