I get what the Love path is trying to do: Seraphina is supposed to fall in love with MC, so their affair is not just about satisfying the desire they feel for one another...
... But the progression of the romance was stuck on kissing for far too long. Even during the latest update, Seraphina still calls their affair a mistake - after repeatedly urging MC to finish inside her.
And since she gets pregnant on either sub-paths, the theory that she would keep the baby if on the Love path is moot; Seraphina bears the twins from MC no matter how you treat her.
It really does come down to personal preference between path flavors, but I feel Lust still wins out overall not just in scene quantity & variety, but the tone between them is still "lovey" enough to where it doesn't feel like MC is taking advantage of her. I imagine her realizing she is pregnant in 1.2 might even further blend the two paths together (
since, despite her protests, she does end up carrying MC's children to term on the Lust path).