Dual Core with 512MB or Single Core with 1GB?

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Android 4.0... for web browsing, skype and trading at the same time:

PD10 FreeLander 1.2GHz 512MB RAM
CPU: Telechips TCC8923; Cortex-A5 Dual Core; GPU: Mali-400 MP

or

Ainol Novo 7 Tornado Tablet Review 1.0GHz 1GB RAM
CPU: Amlogic 8726-M3L; Cortex-A9 Single Core; GPU: Mali-400


Any help is welcome, thank you.