Well they are the two most popular series on Dynasty right now so it's understandable that they are compared. Much like how Naruto, One Piece, and Bleach wer...are constantly compared against one another. It's inevitable. One thing about Citrus is that it started off literally just like any other het romance story. Boy force kisses girl and girl falls for him like some weak-kneed individual despite having a clearly strong individual no BS personality before said kiss. Citrus started turning around with the father arc in my opinion but then it had that ridiculous childhood friend pseudo love triangle arc. It went backwards. Stretch on the other hand, has far superior story telling and characters mixing with elements of drama, humor, stretching, and teasing while managing to keep most things a mystery to the readers.
I think Citrus' problem is is that we rarely get long running yuri series here with good artwork and Citrus has/had a lot of potential. Thus it gets a lot of attention despite not being a very well written story (my opinion).