Lumia 630 vs 625

Hey guys,

i finally convinced my wife to pick a windows phone device. She does like the Lumia 630 very much, but i am not sure if the 625 could be a better pick.

Watching the specs i think there is one major tradeoff between both.

625 with front facing camera and led flash but only 1.2 ghz dual core

vs

630 without front cam and flash but with 1,2 ghz quad core

Is there anything i am not getting about the 630 ? And do you think the faster cpu is making a huge difference?