I like and have had both..but prefer the guard and voted that way. It adds a nice contrast to the instrument in the same way it does on a strat vs. say a jackson.
If I get another Explorer, I believe I'd go with a black guitar w/ white pickguard.
Ill go for no pickguard since mine is like that. But i do also like ones with pickguards, kinda classier and has more of an oldskool look, wilst without its more modern looking.