Jeff wrote the "best known" songs mostly; Kerry's songs were usually more rhythm-orientated and on some albums he was more productive, on some Jeff. Kerry was always the more public person, which may or may not have suited Jeff anyway.
In any case, it is a very sad thing, and he died quite young as well.
I wonder what ESP will do with his signature guitar line. I hope they can refrain from trying to cash in on this tragedy.