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Well, if we're talking about the Dragon and Jela, the best option would be:
Jela: upgrade Archers, Rangers, Elves, and Great Elves to Snipers – but this isn't a cheap endeavor...
Dragon: upgrade Mages, Archmages, Monks, and Fanatics to Wizards – also not a rare treat.
It will be difficult to determine which is better, as Wizards are stronger than Snipers, but there will be more Snipers because Rangers and Elves are more accessible...