I believe they both 사랑 Bella fervently. However having said that, the 사랑 that Edward has for her is 더 많이 profound. He evens describes it as being close to imprinting. Which is what Jacob faces later on which someone else. (Sorry to those who haven't read breaking dawn) Therefore its impossible for Jacob to 사랑 Bella 더 많이 than Edward.
I think edward does 사랑 her 더 많이 even though they both 사랑 her alot.But I think that since edward has been living for 더 많이 than a 100 years and he never fell in 사랑 intill he met bella,and he dicided to get married and live with her forever he must really 사랑 her.Also he left to like protect her even though he really loved her.And I mean jacob imprints and he didn't imprint on bella so it wasn't the person for him.So yea Edward:)
before jake imprints i think that he did 사랑 her and would do anything 4 her but as edward did say jake might imprint someday (as he does with bellas daughter!!!) and he might break her 심장 so i think that its not so much that edward loves her 더 많이 just that he would never have 2 put her through that.