It's simple really;

Oracle of Ages was more puzzle orientated
Oracle of Seasons was more action orientated.

The combat system in the games is pretty simple, and enemies are easy to deal with, making Ages marginally less easy, and is therefore slightly more enjoyable.

Also, it has Zoras in it, and I think Ralph adds an interesting element to the storyline that you just don't have in Seasons.

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~emkay
[KousouGames]
[last.fm]