[quote]I'm disregarding GO because info on Servants is incomplete and it will be until we get Grand Order Materials, just for the record. [/quote]
There are a lot of information already out on that thou, no?
GO Servants(Ignoring their appearance in other titles for this) with A-Rank strength:
Saber Alter
[s]Saber addict[/s] Gaius Julius Caesar
Le Chevalier d'Eon
Arash
Musashibou Benkei
Prototype Chulainn
Lancelot(Berserker)
Spartacus
Vlad III
Darius III
[i]Unrelated Note: Kiyohime Waifu has only E rank? Poor Berserker ;w;[/i]

The good Grand Order wiki has no information on Sakata Kintoki or Euryale. Obviously, most Berserkers have a higher strength than A(+ or ++)

Source: [url=http://fategrandorder.wikia.com/wiki/Servants]Grand Order Wiki[/url]