From what I've seen so far, publishing seem to love comp titles. They really help to see where your book would sit on shelves at a book shop, which readership it might appeal to, etc... Good comp titles can help an agent decide how quickly they will read your submission and its potential.
My agent loves comp titles and like a lot of agents she uses them when pitching to publishers. It's tough to come up with good recent titles. It took a lot of head scratching and searching before I found the right ones. In the end that's what I said in my submission letter: "It will appeal to readers of Lucy Foley’s The Hunting Party for its oppressive atmosphere and vivid setting and to readers of Kate Elizabeth Russell’s My Dark Vanessa and Sarah Henstra's The Red Word." (the reason for My Dark Vanessa & The Red Word was explained in the sentence before that one, hence why it's not in this sentence).
You can use books, TV shows or films. When Katie Khan submitted Holding Back the Stars, she used the comp titles: One Day meets Gravity.
Definitely stay away from massive bestsellers and very successful authors. If you can use titles released in the last 5 years great, also bonus points if any of them are debuts. Good comp titles also show that you know the market you want to publish in and what's around at the time you are submitting.
I hope this helps.