Santosh, like I mentioned above, the certification is not mandatory but some kind of an assurance to the buyer that the specs mentioned are tested at Lucasfilms' labs and true. THX does certification on products across the range, so really no point comparing a THX and a non THX product. I am not sure what reviews you read, but to compare a Denon 1910, you need to compare it with an Onkyo of 600 series and above (folks - correct me if I am wrong).
BOSE does not need any certification, just the name itself sells. Since you are new in the forum and probably to the hobby too, let me tell you that Bose is not very highly regarded in HFV and similar forums. There are brands/products which can beat a Bose at half the price. But the Bose speakers of yesteryears were really good. Personally, I have heard an old 301 (reflecting speaker) at my cousin's place and was really impressed. But the things they sell today are first over-priced and hyped and secondly nothing great SQ wise.