I only have the champion seeds so I can't check, but when they introduced Yellow Dwarf they said they made them the same... what is the description for the Gaia stone?

The Gaia seed offers you a foal just like the horses you started with. No extra skills, genetic potential is not very high, it's just another horse.
The foal from the champions seed comes with very high inborn skills even though it has the same genetic potential.

For me, it wouldn't be worth it, but I avoid buying anything anyway. If I had to choose, I'd choose the champions seed since the Gaia foal feels pretty much useless while the champions seed horse can actually win some competitions for quite some time.

But, as I said, for me, personally, they're not worth it. There are various horses in sales, which may reach similar skills but also provide some genetic potential so their offspring will have better genetic potential as well.

Thanks for the great input everyone very much appreciated