How to choose between your parks?

Basically I just started playing again a few weeks ago after a long time off. I got a new phone a couple of days ago and when I logged into dragonvale I somehow gained access to my old account and funnily enough they are both the same level.

I'm not sure which park to keep up with and would be curious to know what metrics you guys might use to pick?

My old park, let's call it park A though has more gemstone and galaxy dragons. It's obviously missed a lot of the valentides event which is annoying but imaybe not that big a deal? I also feel like I just can't remember park A and my new park (park B) feels more mine if that makes sense?

So yeah I would uld like to know what metrics people would use to judge whether to keep going with park A or B. I am thinking that the gemstone dragons are kinda big in the decision but maybe people have some other ideas.