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I am just wondering what is the most common, or most used, block cipher mode used to goes with CTS? ECB or CBC?

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What is CTS? CipherText Stealing? – poncho Mar 8 at 19:43
Yes. I guess this is really a matter of opinion. – h221baker Mar 8 at 20:10
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You should not use ECB at all (it is insecure), so I hope it is not "usual". – Paŭlo Ebermann♦ Mar 8 at 20:24

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There is a NIST definition of CTS (CipherText Stealing) mode at: http://csrc.nist.gov/publications/nistpubs/800-38a/addendum-to-nist_sp800-38A.pdf.

The title of that addendum answers the question: "Recommendation for Block Cipher Modes of Operation: Three Variants of Ciphertext Stealing for CBC Mode".

The paper is also useful to understand that there are many different ways to do ciphertext stealing.

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