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And why exactly are horses better than angels, if I may ask? 3 angels (if with Castle) are definitely much more preferable than 6 horses, and likely even 2 as well, for many reasons; but I'm interested to hear why you think horses are better. Or are you talking about TE again?
Secondly, after building them, you still have to buy them out, which adds more hassle. That is, while the player who placed angels is saving money for the buyout, the one who built horses on 121 has already bought everything and started upgrading.
But even if there is money for the buyout, let's compare the effect:
2 angels + 7 monks
vs
6 horses (usually upgraded) + additional crusaders, marks, pokies (thanks to Castle).
The first option is a significant loss in both HP and damage (monks are generally useless here; you can't take them into "cans," hives, or Dragon Utopia). In TE, if you start as Turis, the difference is even greater (+25% HP for horses). Essentially, the first option only works out if you manage to quickly assemble a strike stack of angels and upgrade them (typical for Jebus Cross, as well as a number of fixed maps). That is, when the advantage of one strike stack is higher than all the bonuses provided by horses.