You're right on the fact that I wouldn't use the phrase "my phone is
better" at the beginning of a conversation, without specifying the
reason.

However, if I was writing a review comparing two phones, and at the
end of the comparison came to an overall conclusion, then I would say
something like "overall this phone is better".

You'd still add the "than that phone" part in the Klingon.

blah, blah, blah, 'ach...

Hoch qellu'DI' ghogh HablI'vam QaQ law' ghogh HablI'vetlh QaQ puS.

-- 
SuStel
http://trimboli.name