The emotional resonance of a Regency romance, for me, often hinges on the author's ability to make the constraints of the era feel real and then show love thriving within or gently pushing against them. Mary Balogh is the master of this. Her characters are often bound by duty, past trauma, or social expectation, and their journey toward intimacy feels earned and profound. 'Slightly Dangerous', the last Bridgerton book, is a perfect example of a seemingly cold hero thawing.
Contrast that with Lisa Kleypas, who uses the era as a lush backdrop for intensely passionate stories where the emotional and physical connection is front and center. Her heroes are famously charismatic and alpha, but she gives them vulnerability. So it depends: do you want a slow, emotional waltz or a passionate declaration in the garden?