Romance novel writing and reading is the focus of this question so you can state the better novels or state your favorite novel. Feel free to write in any answer above, although bear in mind I wrote a separate article on authors.
What makes a good romance novel?
A great number of romance novels require a hero and heroine, a problem that will keep them apart, a struggle to make the relationship work and a commitment at the end. Writers that can use this formula and somehow compete in today's ultra-competitive market, via skill in their storytelling, or with intelligent marketing can market/write a good romance novel, aside from the readers' personal inclinations and liking of their narratives and style of communication. Yet subgenre specialisation is also a great way to write a good romance novel - as evidenced here with prominent writers named for each subgenre. In terms of examples of subgenres, Christian romance is one example of a subgenre, another is paranormal romance.
Many other sites can assist in answering this question. There are many good results in an internet search for 'romance novels' with the results generating articles about the top twenty plus novels written this year as well as over the years from sites such as Goodreads. There are over 100 romance-related book reviews in the everywhere section on WeekendNotes. I think the very nicely compiled and presented article as well as this other article, both from WeekendNotes' Jennifer Muirhead, are a super way to help learn about romance novels. Also, by Liz Schumer of Goodhousekeeping.com is a very informative article about the best romance reads of 2021. Finally, based on these Wikihow pages, reading a lot is a very strong basis for reviewing - hence I'm suggesting that if one reads a lot (especially romance novels) then it's a great reason to write an answer in above. However, from all of the aforementioned, I'm sure there is plenty of reasons to try answering what is your favorite romance novel?
NOTE: as both novels and authors are large enough topics to organise themselves/appear as individual articles, I've written authors as a separate article.