Sorry, but to avoid endless forum spamming we try to stay away from "best place", "best service", best anything type threads.
Please take a moment to read the Domain Forum Charter to familiarize yourself with the rules:
[webmasterworld.com...]
There are many parking firms. Search "domain parking", "domain monetization", "domain revenue", "domain income", "domain traffic", etc. Lots of companies.
It's wise to move your domains around and experiment. Each service has it's own version of landers and landing optimization system, so your results may vary. Try several and see which performs the best for the traffic your domains deliver.
Since we're not getting into parking company endorsements I'm not locking this thread.