They are totally different platforms and need totally different CPUs.
Summary
1366 supports more PCIE lanes and supports i7 9XX processors
1155 supports i5 & i7 processors with numbers beginning with 2 is a newer technology which replaces 1156. It is also alot cheaper than 1366.
 

majju2

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Nov 30, 2010
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Did not know that! Thanks. DO you know any good asus boards?
So u said 1366 is better than 1155 performance wise?
 

jpmucha

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If you need your new system in the next 2-3 months... you might be forced to look at the LGA1366 solution. Check one of the many threads on the forum describing the H67/P67 chipset issue.

SB processors themselves are great! If you can wait, the Z68 chipset will supposedly not exhibit the SATA2 issue... around the time H67/P67 'fixed' chipsets reach wide distribution (April-ish).
 

Raidur

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If you have the patience then wait it out. Sandy Bridge CPUs have fantastic performance and overclocking headroom while running cool/efficient. (4.6-5ghz on air)

1366 CPUs are still good, but Sandy Bridge being nearly the same price is definitely worth the wait IMO.