I saw it mentioned that these changing sites keep info on transactions. I assume that includes matching IP addresses with transactions. If I'm not mistaken tor hides your IP but the site can see that you am using tor which could cause other problems (potentially??). So is this safe? If not, what are my options? Also is there a better change site to consider?
"Safe" is relative. Don't use that word.
Yes. Changelly does not block tor currently. That could change at any time.
They could block tor IP's. They could single your transaction out as being associated with tor, and flag it as suspicious. It could happen.
I said don't use that word.
Options for what?
It depends on your parameters. What's most important to you?