I think Jason and his family are not compatible with her. I can't remember what her family is like, but the sappy, emotional, goo at jason's house really bugged me.
I hate to say it, but I also think that Jason is Jewish and De is greek orthodox. Not that De has mentioned faith at all, but there are cultural differences there too.
I don't think she is compatible with Jesse either as he is not grown up yet (not that she is, but she thinks she is)
So, neither is a good match for me.