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Hello. :)\
1) Naga\
2) Black Knights.\
And now, let's analyze:\
Let's think about it.\
The Black Knights' damage is 15-30. So, the average damage will be (15+30)/2 = 45/2 = 22.5. Double damage occurs in 20% of cases. So, the average damage of the ability is 45*0.2 = 9.\
The total damage with the ability is 22.5 + 9 = 31.5. What do you think of these calculations?\
Naga damage is 30.\
It turns out that, on average, a Death Knight, together with its ability, deals more damage. Now let's recalculate with the difference in attack. Each unit = 5%.\
So, 18 (Black Knight) - 16 (Naga) = 2. 2 * 5% = 10%.\
=> 31.5 + 10% = 31.5 + 3.15 = 34.65. Against Naga's 30.\
So, the damage is 6.45% higher. :)\
The downside of Naga is that there is a 5-point difference in defense. So, 5 * 5% = 25%.\
Let's move on.\
Curse acts like inflicting the lower damage threshold. BUT for Naga, the damage is fixed. So, the curse won't affect them in terms of damage. Let's look at it from another angle: if Naga attacks, it doesn't get a counter-attack. It turns out that with each Naga attack, the Knight won't attack, i.e., when the Knight attacks, the Naga will attack. So, the Knight has one less attack, which gives Naga a 50% advantage (with almost equal attack). A 50% advantage more than compensates for the 25% defense that Naga lacks. So, 50% - 25% = 25% advantage for Naga.\
Therefore, I put Naga in 1st place and the Knight in 2nd.\
Regarding the price, it should be noted that one Castle with a Capitol buys all the available units (except for the Tower; it lacks about 900 gold, which is more than compensated for by a hired support hero that generates income (350 gold/day = 2450/week).).\
So, I don't think it's appropriate to compare them based on price.\
Comparing them based on speed is also not very useful, as tactics/acceleration/deceleration are decisive, especially on Expert difficulty. From my experience in online games, I've noticed that by the end, there's a good chance that one of this "trio" will already be on Expert difficulty by the time of the "major battles," so the speed difference is not significant, although the Black Knights will move first due to higher priority, which is related to speed. However, even if we assume that the Black Knights attack the Naga first, the loss (described above) of 25% won't save the Knight. :))\
If I made any mistakes in my calculations, please correct me