Depends upon what I need it for. (See detectors at the left).
Looking for brass / lead at a crime scene ---- Tesoro Compadre or LST
Coins & Jewelry in a park or school yard ---- White's DFX-300, XLT or my ol' standby Eagle II SL
(If there's lots of electrical interference / radio traffic (airport nearby) the DFX is nearly useless.)
Prospecting ---- Minelab GP3500 / Tesoro Lobo SuperTrac (LST)
--- Al