Nargott
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If a Castle is available, Knights are just as good as Angels.
Knights: 1000 x (4-8)
Angels: 3000 x 2
That is, if we build Knights, we get 4 at once (4000) and +8 weekly, plus an additional +8000 upon upgrade. If we build Angels, we get 2 at once (6000) and +2 weekly, plus an additional +6000 upon upgrade.
Griffins: 1000 x (3-6)
The growth rate is less powerful than that of Knights, which is why they are easier and faster to build (no need for a basic stable).