In 500 years, I'd bet that we'll have figured out how to transfer our consciousness to giant Panda-shaped robots that can fly through space using solar wind. So really not need to colonize other planets, per se.
This, but not joking. Maybe without the panda part. In 500 years parallel tochnologies will make this a very different question to answer. It's almost certain that we'll no longer need anything beyond a decent energy source to thrive, and we will almost certainly
have figured out how to upload a mind to a synthetic platform. Heck we might be able to do that in 50 years or less.
So technologies like stasis, generational ships and what animals to take to make a colony will be redundant. Add FTL comms to this (assuming that's possible) and every planet we've been able to send probes or whatever to will be instantly accessible to anyone at all. At least those who have access to avatars of some sort. Most folks will probably just live inside the internet and never become physical at all. We will become machines and machines will become us.