Yes, that 24 hour timer is very annoying indeed.
Armored Alicorns are 15 Golden Troll Tokens, Unicorns 25.
But if you don't have many Spellbound Dew droppers yet, those guaranteed drops each day can really make a difference...
I would still go for the Unicorns, but you can't go wrong either way, they are all must haves!