ace is 2.2 and S is 2.1?
I meant android os version?
is it worth spending xtra 10k for s2 over s1?
1. Processing power: dual core CPU, more RAM and ROM means that the SII is much much faster and can do multitasking without any lag. And being a dual core processor, the power consumption should go down as the processor won't be at heavy usage and that reduces the power consumed by the processor.
2. Display: the SAMOLED+ is much much much better, thanks to Samsung for moving from inferior Pentile matrix to Real Stripe (more info here: Galaxy S II and Galaxy S screens compared at the subpixel level (video) -- Engadget)
3. build: one major complaint with the SGS was the real panel build quality. The SGS II is not only thinner, it is stronger and is not a fringerprint/scratch magnet.
4. Bluetooth: while SGS has BT v3.0, it's not a high speed BT. Yes, v3.0+HS that SGSII has provide lot lot higher speeds
5. Camera: more mps, LED flash, 1080p recording. way way better
6. Much better battery life
7. There are few other things too like better GPS etc.