Is it better to have more Ghz or more cores in a processor?

have choice both of pretty same price 1 had more cores other has more ghz

option 1

amd phenom ii x4 965 - 3.4 ghz am3 black edition cpu

specs: interface:socket am3
bus speed:4000mt/s
no. of cores:4
core name:dragon
core frequency:3.40ghz
core voltage:0.85v-1.425v
process technology:45nm
thermal design power:125w
l2 cache:4 x 512kb
l3 cache:6mb
gross weight (kg):0.50kg

option 2

phenom ii x6 1045t 6 core processor 2.70 ghz, 6mb cache, socket am3

so have choice both of pretty same price 1 had more cores other has more ghz option 1 amd phenom ii x4 965 - 3.4 ghz am3 black edition cpu specs: interface:socket am3 bus speed:4000mt/s no. of cores:4 core name:dragon core frequency:3.40ghz core...

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