QTH.COM Swap Chat

I have just installed a Yaesu FT-8900R on my mobile. Am presently using my my Larsen 2/440 dual-band mag mount. Now, I would like to purchase one of the Quad-Band ants. available: Comet UHV-4 or the Diamond CR-8900A. Would appreciate any and all comments about the perfomance (pro or con of either/both of these ants).. I highly respect the more knowledgable HAMS and and their technical input in such matters. Thanking ya'll in advance for any input!!!!!
Jerry KF4UJA