Becks is the no.1 enigma but now he has become a passenger. Gerrard is more of an enigma because we all know what he can do yet he produces sparingly for England, most of the time, he is anonimous - perhaps this is due to the fact that he is asked to play out of his natural position or asked to hold when he plays in central midfield.
At Chelsea, Lampard is an important goalscoring midfielder and he has been more prolific than Gerrard while not as energetic. I don't forsee Chalsea sacrificing Lampard's game to accommodate Gerrard (if he goes there), Gerrard will more likely take up Makelele's posotion as the holding midfielder and sit back more. He may not be given the freedom of playing like he enjoys at Liverpool but with a very clever coach like Maurinho and with unlimited wealth from Abrahamovic, Chelsea will be able to promise Gerrard a strong squad which will challenge for top honours all the time.
Realistically, this is a big lure for a player who has yet to win a major medal like the EPL or the CL.