[tor-relays] Onion address or clearnet address

Some sites such as RiseUp and DuckDuckGo could be accessed via onion addresses. I would like to know which address (onion address vs clearnet address) should I use when using TBB. I believe both ways are more or less the same in terms of identity protection and communication security (provided that the clearnet addresses are using HTTPS). Perhaps the main difference is using the clearnet addresses adds burden to the exit relays, while using onion addresses only consumes bandwidth of middle relays which is relatives more in supply.

Am I right? Do I overlook anything? Or it doesn't matter at all for either way?

Best Hang