I have been using both in a version of the deck called "Almost Blue".
My conclusions would go along with some of what has already been said here:
Gush sucks unless you are going off. I haven't been using drain either, which makes it virtually useless unless you are combo'ing off. At least it pitches to Force of Will. The only use I have had for Gush with Frantic Search is that it helps off set the loss of cards while going off. This is of course aside from Fastbond which is obviously retarded.
Frantic Search is surprisingly enough the card I am most happy with. It has been an excellent set up spell, and a great combo enabler.
Also, I really like High Tide.